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Keep 用法

Keep 用法
Keep 用法

Keep 用法知多少

keep 是英语中用法灵活的动词之一,用法归纳如下:

一、用作系动词,意为“保持(某种状态)”,其后常接形容词作表语。如:

Please keep quiet / silent! 请保持安静!

After the accident, he still kept alive. 这次事故之后,他仍然活着。

二、用作实义动词,可表示:

1. 保管;保存;保留。如:

Keep the change. 零钱不用找了。

Please keep these things for me while I am away. 在我离开期间,请你替我保管这些东西。

2. 赡养;饲养。如:

Does he earn enough to keep himself and his family? 他的收入够养活他自己和他的家人吗?

I used to keep sheep in my childhood. 我在孩提时常常养羊。

3. 经营。如:

Her father kept a grocer's shop for a number of years. 她父亲开了几年杂货店。

4. 坚持;继续。后面如接动词,要用V-ing 形式作宾语。如:

If you keep (on) practising your spoken English, you'll soon make great progress. 如果你坚持练习英语口语,你很快就会取得很大的进步。

5. 阻止;阻碍。常用于keep sb/sth from doing sth 结构中,其中介词from 不能省略。如:

The heavy rain didn't keep them from watching the football match. 大雨没能阻止他们观看足球赛。

6. 保持。其后常接复合宾语,表示使(某人或某物)保持某种状态或使某一动作继续。

①keep + sb/sth + 介词。如:

If your hands are cold, keep them in your pockets.

如果你觉得手冷,就把它们放在口袋里。

②keep + sb/sth + 形容词。如:

These gloves will keep your hands warm.

这种手套保暖好。

③keep +sb/sth + 副词。如:

The cold weather kept us indoors.

寒冷的天气使我们呆在家里。

④keep + sb/sth + V-ing 形式,表示“让某人/ 某物一直……”,强调动作的持续性。如:

I'm sorry I've kept you waiting.

很抱歉,让你久等了。

⑤keep + sb/sth + V-ed 形式,表示“让某人/ 某物一直被……”,宾语是V-ed 形式,表示的动作的承受者。如:

She kept her eyes shut and stayed where she was.

她紧闭双眼,呆在原地未动。

7. 构成的其它动词短语有:

keep a record (保持记录),keep apart (把……分开),keep back one's tears (忍住眼泪),keep in touch (with) (保持与……的联系),keep out (of) (把……关在外面),keep up (保持;使……不能入睡),keep one's / an eye on (照管,密切注视),keep away (from) (离开;不接近;戒除),keep in mind (牢记),keep one's word (遵守诺言),keep pace/step with (跟上……的步伐),keep up with (与……同步;跟上)等。

英语中“除……之外”表达种种

1. besides 意为“除……之外(还有)”时,常常包括所除对象。如:

Besides English, I know a little Japanese.

除了英语,我还懂点日语。

但当意为“除……之外(没有)”时,仅用否定句中,且可与but ,except 互换。如:

There aren't any other people here besides (= except / but) Tom and me.

除了汤姆和我之外,这里没有其他的人。

2. but 意为“除……之外(再没有)”,用于表示从整体中排除同类的事物,并常和all ,no ,nobody ,anybody ,nothing ,anything ,everything ,everyone ,who ,where 等词连用。如:

All of us went to see the film but Bob.

除了鲍勃,我们都去看电影了。

Nobody was late for class, but Mary.

除了玛丽,上课没人迟到。

Who but John would do such a thing?

除了约翰,谁还会做这样的事呢?

注意:(1 )在疑问词后只能用but ,而不能用except 。

(2 )but 后面可以接不定式,表示“只是;只得”,但如果but 前有实义动词do 的某种形式时,则but 后接不带to 的不定式。如:

In winter a cold-blooded animal has no choice but ( = except ) to lie down and sleep.

冬天冷血动物除了躺下睡觉外,别无选择。

The boy did nothing but (= except) cry.

这个男孩只是哭。

3. except 意为“除……以外”,其意义和用法基本与but 相同,但except 后还可接副词、介词短语、从句等,而but 不能。如:

I looked everywhere except there.

除了那里,我哪儿都看了。

The window is never opened except in summer.

除了夏季,这扇窗户从来不开。

I usually go to work by bike except when it rains.

除了下雨,我通常是骑车上班的。

4. except for 意为“除去(一点之外)”,表示从某一细节来修正前面概括性的说法,for 后的宾语一般与句子涉及的内容不属同一类。如:

The coat is very beautiful except for its color.

除了颜色,这件外套很漂亮

keep 的用法

Keep的用法: keep vt., vi. kept, keeping 保留;保守 I keep old letters.我保存旧信。 I'll keep the original copy of your report on file. 我会把你报告的原件归档的。 It's an interesting suggestion and we'll keep it on ice." 这是一项有趣的建议,我们将留待以后考虑采用。" 保持;继续 We will keep on trying and, if we get anything done, will notify you. 我们将继续努力,有结果将通知你。 Leaders shouldn't keep themselves aloof from the masses. 领导人决不应该脱离群众。 Keep calm!安静! You shouldn't keep chopping and changing like this; you'd better make up your mind right now! "你不能再这样变化无常了,最好现在就拿定主意!" 遵守 He keeps to his promise.他守约。 "Everyone should keep discipline, and you, officers are no exception." "每个人都应该遵守纪律,你们军官也不例外。" 保卫;保护 Keep the baby warm.别把婴儿冻着。(常与from连用)防止;抑制 Keep one's temper。抑制住不发脾气。 Keep a curb on your anger.请抑制住怒气。 扣留;留下 Please keep me a place in the queue.请在队里给我留个位置。 赡养;饲养 to keep a dog养狗 Farmers usually keep chickens in their backyard. 农民们通常在自己的后院养鸡。 经营;经销;管理 to keep a shop开商店 to keep house治家 (常与from连用)远离;不接触 Keep away from the scene of the accident.勿靠近事故现场。 Their dog looked dangerous, we decided to keep our distance from it. 他们家那条狗样子很凶恶,因此我们决定离它远一点。 But the stone walls keep the farmer's cows from joining his neighbor's cows. 但是石头墙使这家农民的母牛不会加入到邻居的牛群中去。

keep的用法

1.keep +形容词 2.keep+sth/sb +形容词 3.keep +doing 一直做某事 4.keep ... from doing ... 阻止做某事。。。 5.keep a pet 饲养一个宠物 6.How long may I keep this book ? keep指借。 keep的用法小结 keep是高考常考词汇之一,其含义丰富,与其搭配的短语也很多,其主要用法如下: A、用作及物动词 (1)保留、保存、保持、留下 e.g. We'd better keep a seat for him. 我们最好给他留个座位。 He kept all the money in the bank. 他把所有的钱都存入了银行。 (2)履行(诺言)遵守 e.g. One should keep one's promise. 一个人应当遵守自己的诺言。 Everybody must keep the law. 人人都必须守法。 (3)赡养,养活,饲养 e.g. He has a large family to keep. 他有一大家人要养活。 The old man kept many animals like dogs, pigs and cats. 这位老人养了许多动物,像狗、猪、还有猫等。 (4)经营,管理

e.g. He kept a hotel in this city. 在这座城市里,他开了一家旅店。 She is good at keeping house. 她擅长管理家务。 (5)保守(秘密),记(日记、帐) e.g. All of the people keep the Spring Festival in our country. 我国所有的人都庆祝春节。 Some of them keep birthdays. 他们中有些人庆祝生日。 (7)使……处于某种状态(情况) 在这种情况下,keep常跟复合结构(keep+宾语+补语)。用作宾语补足语常见的词有现在分词、过去分词、形容词、副词以及介词短语。 e.g. He kept me waiting for half an hour. 他让我等了半个小时。 Keep your mouth shut and your eyes open. 少说话,多观察。 The doctor kept me in for a week. 医生一周没让我出去。 He always keeps his books in good order. 他总是把书放得整整齐齐。 B、用作不及物动词 (1)保持、继续(处于某种状态)(keep为连系动词)

IF的用法

IF的用法 if是英语中出现频率很高的连词,并且它的用法也很多。学生感到很难掌握,为了让同学们更多更好地了解其用法及其语法功能。现结合教学中遇到的情况,予以归纳,以供参考。 一、if作为连词,引导条件状语从句,它表示的意思是“假如”“如果”等。在复合句中如果主句用将 来时,则if引导的状语从句用一般现在时。例如: 1. If itdoesn’train, we will go to the park next Sunday. 如果天不下雨,下周星期天我们将去公园。 2. If you ask him,he will help you.如果你求他,他将会帮助你。 二、if还可以引导让步状语从句。这时if当作“即使是”,“虽说”解。例如: 1. If she’s poor,at least she’s honest.虽说她很穷,但至少她还是诚实的。 2. If I am wrong,you are wrong,too.即使说我错了,那么你也不对。 3. I’ll do it, even if it takes me all the afternoon.虽然会花费我一下午的时间,我还是要做这事。 三、if作为连词还可以引导宾语从句。引导宾语从句时和whether意思相同。例如: 1. Lily asked if /whether she liked it. 莉莉问她是否喜欢它。 2. She asked if /whether they had a cotton one.她问是否他们有一件棉织的。 四、if引导时间状语从句,当if做“当”或“无论何时”解而不含有条件之义时,if从句中的时态与主句中的时态相同。例如: 1. If youmix yellow and blue,you get green.你将黄色与蓝色混合,便会得到绿色。 2. If she wants the servant,she rings the bell.每当她需要仆人时,她便按铃。 五、if后接否定动词,用于感叹句中,表示沮丧、惊奇等。例如: I. Well,if I haven’t left my false teeth at home!真倒霉,我把假牙丢在家里了! 2. And if he didn’t try to kn ock me down!(What do you think he did!He tried knock me down!)你猜他想做什么?他想把我撞倒! 六、用于虚拟语气中,if从句中用过去式,表示不可能实现,大概不会实现或提出作为考虑的假定条件。例如: 1. If you were a bird, you could fly.假使你是只鸟,你便会飞了。 2. If I asked him(if I were to ask him) for a loan,would he agree?如果我向他借贷,他会答应吗? 另外,if从句中用过去完成式,表示过去未实现的条件(例如由于不可能实现或某人之未能实行)。例如: 1. If they had startedearlier,they would have arrivedin time.要是他们早些动身,他们便可及时到达了。 2. If they had not started when they did,they would not be here now.如果他们那时不动身,现在他们就不会在此地了。 第三,在文学体栽中,if有时可省略,然后将主语与所用的限定动词(尤其是were,had,should)倒置。例如: 1. Should it (=if it should)be necessary,I will go. 倘若有必要,我会去的。 2. Were I(=if I were) in your place,I would do the same .如果我处于你的位置,我也会这样干的。 3. Had I(=if I had)known earlier,I would come.如果我早一点知道,我就会来。 七、if与其它一些介词的连用。

keep的用法

用作动词(v.) keep about〔around〕1( v.+adv. ) 1. 继续履行职责go on with one's duties keep about〔around〕 She is very ill, but she still keeps about. 她虽然病得很重,但仍然继续工作。 2. 使手边常有have sth always present keep sth ? about〔around〕 I like to keep a few envelopes around in case I need them.我喜欢手边常有几个信封,以应不时之需。 keep about〔around〕2 ( v.+prep. ) keep abreast of( v.+adv.+prep. ) keep after( v.+prep. ) keep aloof( v.+adv. )

keep apart( v.+adv. ) keep at( v.+prep. ) keep away( v.+adv. ) keep away from( v.+adv.+prep. ) keep back( v.+adv. ) keep behind1( v.+adv. ) keep behind2 ( v.+prep. ) keep by1( v.+adv. ) keep by2( v.+prep. ) keep down( v.+adv. ) keep for( v.+prep. ) keep from( v.+prep. ) keep going( v.+adj. ) keep in1( v.+adv. ) keep in2( v.+prep. )

Keep_用法

Keep 用法知多少 keep 是英语中用法灵活的动词之一,用法归纳如下: 一、用作系动词,意为“保持(某种状态)”,其后常接形容词作表语。如: Please keep quiet / silent! 请保持安静! After the accident, he still kept alive. 这次事故之后,他仍然活着。 二、用作实义动词,可表示: 1. 保管;保存;保留。如: Keep the change. 零钱不用找了。 Please keep these things for me while I am away. 在我离开期间,请你替我保管这些东西。 2. 赡养;饲养。如: Does he earn enough to keep himself and his family? 他的收入够养活他自己和他的家人吗? I used to keep sheep in my childhood. 我在孩提时常常养羊。 3. 经营。如: Her father kept a grocer's shop for a number of years. 她父亲开了几年杂货店。 4. 坚持;继续。后面如接动词,要用V-ing 形式作宾语。如: If you keep (on) practising your spoken English, you'll soon make great progress. 如果你坚持练习英语口语,你很快就会取得很大的进步。 5. 阻止;阻碍。常用于keep sb/sth from doing sth 结构中,其中介词from 不能省略。如: The heavy rain didn't keep them from watching the football match. 大雨没能阻止他们观看足球赛。 6. 保持。其后常接复合宾语,表示使(某人或某物)保持某种状态或使某一动作继续。 ①keep + sb/sth + 介词。如:

英语中if的用法

精心整理1.(表示条件)如果,主句用将来时,if从句用现在时表示将来Hewillcomeifyouinvitehim. 如果你请他,他会来的。 2.(表示虚拟)假如,要是 1 a. b. 句型:条件从句主句 过去完成时should(would)have+过去分词 Ifshehadworkedharder,shewouldhavesucceeded. Thericewouldnothavebeenburntifyouhadbeenmorecareful.

IfmylawyerhadbeenherelastSaturday,hewouldhavepreventedmefromgoing. Ifhehadcomeyesterday,Ishould/wouldhavetoldhimaboutit. 含义:Hedidnotcomeyesterday,soIdidnottellhimaboutit. c. were+ Ifyousucceeded,everythingwouldbeallright. Ifyoushouldsucceed,everythingwouldbeallright. Ifyouweretosucceed,everythingwouldbeallright.

3.是否=whether连接宾语从句 Iwonderifsheisill. 不知她是否病了。 连接词conj. 1.( 2.( 3.( 4.是否 不知她是否病了。 5.(表示因果关系)每一次...的时候(总是会) IfIfeelanydoubt,Iinquire. 我一感到有疑问就随时询问。 if作为连词的时候,一般用于条件状语从句或者是宾语从句或让步状语从句

中考英语keep用法归纳

Keep用法归纳 在人教版初中英语教材中,keep是要求学生必须掌握的四会词之一,现将其多见用法归纳小结如下,以利于大家正确地使用该词。 一、用作及物动词 1.意为“保存;保留;保持;保守“。如: Could you keep these letters for me, please?你能替我保存这些信吗? I“ll keep a seat for you.我给你留个座位。 It can help to keep vegetables, fruit and meat for a long time in hot summer.在炎夏的夏天,它有助于蔬菜、水果和肉类长时间保鲜。 Can you keep a secret?你能保守秘密吗? 2.意为“照顾;养活“等。如: She kept her sister for a week while her sister was ill.她妹妹有病时,她照看她了一个星期。 I have a family to keep.我得养活一家人。 3.意为“留下;不必还“。如: You can keep the pen if you like it.你要是喜欢就把钢笔留下吧。 Keep the change.不用找零钱了。 4.意为“遵守;维护“。如: Everyone must keep the rules.人人必须遵守规章制度。 The teacher is keeping order in class.老师正在课堂上维持秩序。 5.意为“售;卖“。如: The shop keeps everything you need.那家商店里出售的东西应有尽有。

if用法归纳

1. If you eat my food, I won’t talk to you. (P58) 2. I will die , I don’t have food, (P58) 3. What shall we do if it rains tomorrow? 5. She asked me if I was fond of music. 她问我是否喜欢音乐。 6. Can you tell me if they’re planning to come? 你能告诉我他们是否打算过来吗? 7. I don’t know if she’s coming. 我不知道她是否会来。 ◇相关词组 ☆if you want/like如果你愿意的话 You can come and stay with us if you want. ☆if so如果是的话 Are you planning to return to work, and if so, who is going to look after the baby? ☆if not如果不是的话 Has anyone dealt with the technical problems? And if not, why not?☆if necessary/if possible 如果必要/可能的话 We are ready to fight for our rights if necessary. I should like to be back here by 10:30 if possible. ☆even if即使 I’d rather never sell this painting, even if they offered me a million dollars. ☆what if 要是……,那怎么办?如果……那会怎样? What if the boss walked in here now and saw us? ☆as if好像是…… She always talks to me as if she was my sister. ◇相关练习 动词填空: 1. If it ______ (be) sunny tomorrow, I ______( walk) to school . 2. We ________ (not have ) our sports meeting if the

if、 whether 用法总结

whether,if if和whether通用,都表示“是否”的意思。一般来说,后者比较正式,在口语中前者常用来代替后者。但两者有时具有不同的暗示。用whether时,正反两面的选择意义较强,问话人并不在意回答是肯定还是否定;而用if时,则比较强调单方面,即正面,问话人希望得到肯定的回答。另外,还要注意以下几点: 一、whether和if都可以与or not连用;但写在一起时,只能用whether,不能用if。如: I don't care whether (或if) it will rain or not. I don't care whether or not it will rain. (不用if) 二、在引导宾语从句时,应注意: 1、表示“是否”时,两词都能引导宾语从句。 I wonder if/whether you can examine him now. 2、宾语从句移置句首时,用whether,不用if。

Whether it is true or not,I can't say. 3、宾语从句为否定形式时,通常用if,而不用whether。 I asked Tom if Mary wouldn’t come. 4、作discuss等词的宾语,用whether不用if。 We discussed whether we should buy the gift for him. 三、在下列情况下,只能用whether,不能用if。 1、与不定式连用时,只能用whether. He can't decide whether to accept or refuse. 2、在介词后,只能用whether。 Everything depends on whether he is ready. 3、在名词后作同位语时,只能用whether。

keep用法

?keep at 1.坚持做…:继续某项工作或行为 ?keep down 1.压制,镇压:阻止…成长、完成或成功 Keep down prices; keep the revolutionaries down. 控制物价;镇压革命 ?keep off 躲开,避开 ?keep to 1.坚持,信守Keep to the original purpose.遵守原定宗旨 ?keep up 1.保持良好状态Kept up the property保存财产 2.保持;继续We asked her to stop talking, but she kept up. 我们请她别再说话了,但她依旧说下去 3.并行:按相同的水平或步伐继续下去 4.不落后,赶得上:赶上对手、同事或邻居,指在成就或生活方式上 Unsuccessfully tried to keep up with his associates.没能赶上他的同事们 ?you can't keep a good man (或woman) down (非正式)有能力的人是不会被挫折或问题吓倒 ?keep one's feet 站稳,不倒 ?keep goal (主英足)守球门 ?keep going (困难时)努力维持正常生活 ?keep open house 好客 ?keep to oneself 避开与人接触,独处 ?keep something to oneself 守口如瓶 ?keep up with the Joneses 与人攀比 ?keep wicket (板球)守板球门 ?keep someone after (美)(作为对小学生的惩罚)放学后留校

详细版if的用法.doc

一、if作为连词,引导条件状语从句,它表示的意思是“假如”“如果”等。在复合句中如果主句用将来时,则if引导的状语从句用一般现在时。例如: 1. If itdoesn’train, we will go to the park next Sunday. 如果天不下雨,下周星期天我们将去公园。 2. If you ask him,he will help you.如果你求他,他将会帮助你。 二、if还可以引导让步状语从句。这时if当作“即使是”,“虽说”解。例如: 1. If she’s p oor,at least she’s honest.虽说她很穷,但至少她还是诚实的。 2. If I am wrong,you are wrong,too.即使说我错了,那么你也不对。 3. I’ll do it, even if it takes me all the afternoon.虽然会花费我一下午的时间,我还是要做这事。 三、if作为连词还可以引导宾语从句。引导宾语从句时和whether意思相同。例如: 1. Lily asked if /whether she liked it. 莉莉问她是否喜欢它。 2. She asked if /whether they had a cotton one.她问是否他们有一件棉织的。 四、if引导时间状语从句,当if做“当”或“无论何时”解而不含有条件之义时,if从句中的时态与主句中的时态相同。例如: 1. If youmix yellow and blue,you get green.你将黄色与蓝色混合,便会得到绿色。 2. If she wants the servant,she rings the bell.每当她需要仆人时,她便按铃。 五、if后接否定动词,用于感叹句中,表示沮丧、惊奇等。例如: I. Well,if I haven’t left my false teeth at home!真倒霉,我把假牙丢在家里了! 2. And if he didn’t try to knock me down!(What do you think he did!He tried knock me down!) 六、用于虚拟语气中,if从句中用过去式,表示不可能实现,大概不会实现或提出作为考虑的假定条件。例如: 1. If you were a bird, you could fly.假使你是只鸟,你便会飞了。 2. If I asked him(if I were to ask him) for a loan,would he agree?如果我向他借贷,他会答应吗? 七、if从句中用过去完成式,表示过去未实现的条件(例如由于不可能实现或某人之未能实行)。 1. If they had startedearlier,they would have arrivedin time. If they had not started when they did,they would not be here now. 第三,在文学体栽中,if有时可省略,然后将主语与所用的限定动词(尤其是were,had,should)倒置。例如: 1. Should it (=if it should)be necessary,I will go. 倘若有必要,我会去的。 2. Were I(=if I were) in your place,I would do the same . 3. Had I(=if I had)known earlier,I would come.如果我早一点知道,我就会来。 八、if与其它一些介词的连用。 (1)as与if连用,它的意思是:“仿佛、好像”同样引导从句。例如: 1. It isn’t as if we are rich.(We are not rich.)我们不像富有的样子。(即我们不富有) 2. It isn’t as if he doesn’t know the ruler.(i.e.He does know the rulers.) (2)as if还可以引导感叹句。例如: As if I would allow it!(i.e.I would certainly not allow it!) (3)if与only连用。常表示愿望或一个未实现的条件,尤其用于感叹句中。例如: 1. If only he arrives in time!他若能及时到达就好了! 2. If only she would marry me!但愿她能嫁给我! 3. If only she had known about it!(But she didn’t know.) 1.if 可引导状语从句----“如果...,假使...”[就现在,过去,未来可能实现之事加以推测时] If you are tired, we will go straight home 如果你疲倦了,我们就直接回家 If you have finished reading this book, please return it to me Do you mind if I open the window? 如果我打开窗子,你介意吗?

keep 是英语中用法灵活的动词之一

keep 是英语中用法灵活的动词之一,下面笔者就其用法归纳如下: 一、用作系动词,意为“保持(某种状态)”,其后常接形容词作表语。如: Please keep quiet / silent! 请保持安静! After the accident, he still kept alive. 这次事故之后,他仍然活着。 二、用作实义动词,可表示: 1. 保管;保存;保留。如: Keep the change. 零钱不用找了。 Please keep these things for me while I am away. 在我离开期间,请你替我保管这些东西 2. 赡养;饲养。如: Does he earn enough to keep himself and his family? 他的收入够养活他自己和他的家人吗? I used to keep sheep in my childhood. 我在孩提时常常养羊。 3. 经营。如:。 Her father kept a grocer's shop for a number of years. 她父亲开了几年杂货店。 4. 坚持;继续。后面如接动词,要用 V-ing 形式作宾语。如: If you keep (on) practising your spoken English, you'll soon make great progress. 如果你坚持练习英语口语,你很快就会取得很大的进步。 5. 阻止;阻碍。常用于 keep sb/sth from doing sth 结构中,其中介词 from 不能省略。如: The heavy rain didn't keep them from watching the football match. 大雨没能阻止他们观看足球赛。 6. 保持。其后常接复合宾语,表示使(某人或某物)保持某种状态或使某一动作继续。 ① keep + sb/sth + 介词。如: If your hands are cold, keep them in your pockets. 如果你觉得手冷,就把它们放在口袋里。

asif用法归纳

as if 用法归纳 1. as if 从句的作用?as if一般可由as though来代替。 引导表语从句,可在look, seem等系动词后。如: He looked as if / though he was ill. 他看起来好像生病了。It seems as if it is going to rain.看来好像要下雨了。 引导方式状语从句。如: I remember the whole thing as if / though it happened yesterday. The child talked to us as if he were a grown-up. 那个小孩跟我们讲话就像个大人一样。 2. as if 从句的语气及时态 ①as if从句用陈述语气。当说话者认为句子所述的是真实的或极有可能发生或存在的事实时, It sounds as if it is raining. 听起来像在下雨。 He talks as if he is drunk. 从他说话的样子来看他是醉了。 ②as if从句用虚拟语气。当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时, 表示与现在事实相反,谓语动词用一般过去式。如: You look as if you didn’t care. 你看上去好像并不在乎。When a pencil is partly in a glass of water, it looks as if it were broken. 表示与过去或与谈话时间为止发生的事实相反,谓语动词用

“had +过去分词”。如: He talked about the Great Wall as if he had been there before.说起长城来好像他以前去过那里。 The girl listened as if she had been turned to stone.女孩听着,一动也不动,像已经变成了石头。 表示与将来事实相反,谓语动词用“would / could / might + 动词原形”。如: He opened his mouth as if he would say something. 他张开嘴好像要说什么。 It looks as if it might snow.? 看来好像要下雪了。 3. as if从句中的省略。如果as if 引导的从句是“主语+系动词”结构,可省略主语和系动词等成份,这样as if 后就只剩下名词、不定式、形容词(短语)或动词-ing形式等。 He acts as if (he was) a fool.? 他做事像个傻子。 He paused as if (he was going) to let the sad memory pass. The girl left the room hurriedly as if (she was) angry.?女孩匆忙离开房间,好像生气的样子。 From time to time, Jason turned round as if (he was) searching for someone. 词汇学习 1. A smelly gas came out of the cracks.

keep的详细用法

keep 1.NOT CHANGE 不改变[linking verb,连系动词, T] to(使)保持,(使)处于 keep (sb/sth) warm/safe/dry etc?We huddled around the fire to keep warm. 我们挤在火堆边取暖。 keep calm/awake/sane etc?I was struggling to keep awake. 我努力不让自己睡着。 keep sth clean/tidy?Keep your room tidy. 保持房间整洁。 keep sb busy/amused/occupied?some toys to keep the kids amused 一些供孩子消遣的玩具?You won’t be able to keep it secret for ever. 你不可能永远保密下去。 ?Peter cycles to work to keep fit. 为了保持健康,彼得骑自行车上班。 ?Don’t keep us in suspense any longer! 别再让我们心里悬着了! keep (sb/sth) away/back/off/out etc?The police put up barriers to keep the crowds back. 警方设置了障碍物来挡住人群。?If I were you, I’d keep away from that area at night. 要是我的话,晚上就不会去那个地区。?a sign saying ‘Danger: Keep out’ 写着“危险,请勿靠近”字样的告示牌?The little boy kept close to his mother. 那个小男孩总黏着他妈妈。 keep (sb) out of sth?Keep him out of trouble. 别让他闯祸。 ?You keep out of this, Mother (= do not get involved ). It’s no concern of yours. 妈妈,这事你别掺和。不关你的事。 ?How can I cut your hair if you won’t keep still! 你老是动来动去的,叫我怎么给你剪头发!keep left/right (=stay to the left or right of a path or road as you move)靠左侧/右侧〔行走〕keep sb/sth doing sth?Jane kept the engine running. 简让引擎保持运转。 2.继续;重复keep (on) doing sth ?I keep thinking about Joe, all alone in that place. 我老是想到乔,他独自一人在那种地方。?I keep telling you, but you won’t listen! 我一再跟你说,但你就是不肯听! ?She pretended not to hear, and kept on walking. 她假装没听见,继续往前走。 3.保留,留下,留着?You can keep it. I don’t need it any more. 你留着吧,我不需要了。 4.保留,留着 ?We decided to keep our old car instead of selling it. 我们决定留着我们的旧汽车不卖。 ?I kept his letters fo r years. 我把他的信保留了许多年。 ?In spite of everything, Robyn’s managed to keep her sense of humor. 尽管发生了这一切,萝宾还是努力保持了她的幽默感。 5.存放,储存 ?Where do you keep your teabags? 你把茶包放哪儿啦? ?George kept a bottle of whiskey under his bed. 乔治在床底下放了一瓶威士忌。 6.监禁,关押,拘留〔尤在监狱或医院里〕 ?He was kept in prison for a week without charge. 他被关押了一个星期,但没被起诉。 7.耽搁,延误 ?He should be here by now. What’s keeping him? 他现在本该到这儿了,什么事把他耽搁了?

excel中if用法

IF函数技巧 函数:“=IF(A,B,C)”,意思是“如果A,那么B,否则C。” 如“=IF(A1<60,"不及格","及格")”,意思是“如果A1<60,那么‘不及格’,否则‘及格’”。 有时候,情况不是这么简单,比如及格的成绩中又要分为“及格”“良好”“优秀”三个等级,这时就可以在C 中重复应用函数IF,正如你举的例子。实际上,“=IF(A,B,C)”中的A、B、C三处都可以再用函数IF。具体例子请看附件。 性别成绩等级如果A2是“男”,以B2>100为判断条件,否则以B2>95为判断条件;符合条件的为合格,不符合条件的为不合格。 男110合格IF(IF(A2="男",B2>100,B2>95),"合格","不合格") 女80不合格A:IF(A2="男",B2>100,B2>95) 女98合格B:"合格" 男100不合格C:"不合格" 姓名数学等级如果B9是数值,则划分等级,否则复制B9的内容。男99及格IF(ISNUMBER(B9),IF(B9>=60,"及格","不及格"),B9)女80及格A:ISNUMBER(B9) 女缺考缺考B:IF(B9>=60,"及格","不及格") 男59不及格C:B9 [0292]Excel中IF函数的使用 2008-10-15 第一部分:《Excel中IF函数的使用》教案 教学对象:文秘班 课时:45分钟(1课时) 教学目标:要让学生理解Excel中IF函数的意义;知道它的使用格式;掌握它的基础使用

方法,最后能灵活地运用IF函数解决问题。 教学方法:引导、层层深入、任务驱动 教学条件:多媒体教室 教学过程: 一、复习回顾:在Excel中比较运算符的运用。教师提问,学生回答 甲比乙高根据实际情况回答是(TRUE)还是不是(FALSE) 一班比二班少人根据实际情况回答是(TRUE)还是不是(FALSE) 猴子比大象轻TRUE 6>4TRUE 6<4FALSE 强调TRUE和FALSE两个答案,引起学生的注意:通过比较后答案只有两个其中之一,就是TRUE或FALSE。 二、新课导入 提出问题:有没有办法可以改写上面问题比较后的答案?如用’yes’ 和’no’、’ok’和’bad’、’1’和’2’、’好’和’差’、’对’和’错’等。说明:用来替代‘TRUE’和‘FALSE’的两个值是我们自定义的两个值。[学生思考] 教师肯定回答:可以,那就是IF函数来帮你解决这个问题。怎么样来解决呢? 让学生带着问题来学习 三、新课讲授 1、列出IF函数的使用格式:=IF(条件表达式,值1,值2) 2、说明IF函数的意义:如果条件表达式经过判断结果是对(真值TRUE)的,则返回值1;如果条件表达式经过判断结果是错(假值TRUE)的,则返回值2。 3、利用前面复习例子剖析IF函数使用时的固定不变的格式。系统定义值和自定义值时的表达。指明哪是表达式,哪是值。[要详细分析讲解]

keep的详细用法

keep 1、NOT CHANGE 不改变[linking verb,连系动词, T] to(使)保持,(使)处于 keep (sb/sth) warm/safe/dry etc?We huddled around the fire to keep warm、我们挤在火堆边取暖。 keep calm/awake/sane etc?I was struggling to keep awake、我努力不让自己睡着。 keep sth clean/tidy?Keep your room tidy、保持房间整洁。 keep sb busy/amused/occupied?some toys to keep the kids amused 一些供孩子消遣得玩具?You won’t be able to keep it secret for ever、您不可能永远保密下去。 ?Peter cycles to work to keep fit、为了保持健康,彼得骑自行车上班。 ?Don’t keep us in suspense any longer! 别再让我们心里悬着了! keep (sb/sth) away/back/off/out etc?The police put up barriers to keep the crowds back、警方设置了障碍物来挡住人群。?If I were you, I’d keep away from that area at night、要就是我得话,晚上就不会去那个地区。?a sign saying ‘Danger: Keep out’ 写着“危险,请勿靠近”字样得告示牌?The little boy kept close to his mother、那个小男孩总黏着她妈妈。 keep (sb) out of sth?Keep him out of trouble、别让她闯祸。 ?You keep out of this, Mother (= do not get involved )、It’s no concern of yours、妈妈,这事您别掺与。不关您得事。 ?How can I cut your hair if you won’t keep still! 您老就是动来动去得,叫我怎么给您剪头发!keep left/right (=stay to the left or right of a path or road as you move)靠左侧/右侧〔行走〕keep sb/sth doing sth?Jane kept the engine running、简让引擎保持运转。 2、继续;重复keep (on) doing sth ?I keep thinking about Joe, all alone in that place、我老就是想到乔,她独自一人在那种地方。?I keep telling you, but you won’t listen! 我一再跟您说,但您就就是不肯听! ?She pretended not to hear, and kept on walking、她假装没听见,继续往前走。 3、保留,留下,留着?You can keep it、I don’t need it any more、您留着吧,我不需要了。 4、保留,留着 ?We decided to keep our old car instead of selling it、我们决定留着我们得旧汽车不卖。 ?I kept his letters f or years、我把她得信保留了许多年。 ?In spite of everything, Robyn’s managed to keep her sense of humor、尽管发生了这一切,萝宾还就是努力保持了她得幽默感。 5、存放,储存 ?Where do you keep your teabags? 您把茶包放哪儿啦? ?George kept a bottle of whiskey under his bed、乔治在床底下放了一瓶威士忌。 6、监禁,关押,拘留〔尤在监狱或医院里〕 ?He was kept in prison for a week without charge、她被关押了一个星期,但没被起诉。 7、耽搁,延误 ?He should be here by now、What’s keeping him? 她现在本该到这儿了,什么事把她耽搁了? 8、遵守,笃守,恪守 ?patients who fail to keep their appointments 未能如约来就诊得病人 keep your word/promise ?How do I know you’ll keep your word? 我怎么知道您会说话算话? 9、keep a secret保守秘密?Can I trust you to keep a secret? 我能相信您会保守秘密吗? 10、keep sth quiet/keep quiet (about sth)别把某事说出去/(对某事)保密

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