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英语中if的用法

英语中if的用法
英语中if的用法

1. (表示条件)如果,主句用将来时,if从句用现在时表示将来

He will come if you invite him.

如果你请他,他会来的。

2. (表示虚拟)假如,要是

1)时态:可以表示过去,现在和将来的情况。它的基本特点是时态退后。

a. 同现在事实相反的假设。

句型:条件从句主句

一般过去时should( would) +动词原形

If they were here, they would help you.

b. 表示于过去事实相反的假设。

句型:条件从句主句

过去完成时should(would) have+ 过去分词

If she had worked harder, she would have succeeded.

The rice would not have been burnt if you had been more careful.

If my lawyer had been here last Saturday, he would have prevented me from going.

If he had come yesterday, I should / would have told him about it.

含义:He did not come yesterday, so I did not tell him about it.

If he had not been ill and missed many classes, he would have made greater progress. 含义:He was ill and missed many lessons, so he did not make greater progress.

c. 表示对将来的假想

句型:条件从句主句

一般过去时should+ 动词原形

were+ 不定式would + 动词原形

should+ 动词原形

If you succeeded, everything would be all right.

If you should succeed, everything would be all right.

If you were to succeed, everything would be all right.

3. 是否= whether 连接宾语从句

I wonder if she is ill.

不知她是否病了。

连接词conj.

1.(表示条件)如果

He will come if you invite him.

如果你请他,他会来的。

2.(表示虚拟)假如,要是

If I were you, I would never do that.

如果我是你,我决不做那件事。

3.(表示让步)即使

We'll go even if it rains.

即使下雨我们也要去。

4.是否

I wonder if she is ill.

不知她是否病了。

5.(表示因果关系)每一次...的时候(总是会)

If I feel any doubt, I inquire.

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

if引导的条件状语从句:If he comes, please tell me.(如果,假如)

主句和从句位置可以互换,时态:主将从现

变成:Please tell me,if he comes.

宾语从句中:I want to know if(是否)he comes.

可改成:I want to know whether he comes.

当句子中有or not是只能用whether——I want to know whether he comes or not. 时态:1.主过从过 2.主句一般现在时,从句任何时 3.客观真理用一般现在时

让步状语从句中,if 解释为即使

名词cn. 条件;设想

There are too many ifs in his offer.

他的提议中条件太多了

if从句的过去时态

if从句的过去时态 if从句的过去时态不是跟的过去时态,是虚拟语气 if i were you ,i'll take it.如果我是你我就买了。这里的were并不是说我以前就是你,这里表示的一种假设,一种不存在的情况. if后面可以接的时态 1.if引导的条件状语从句中用一般现在时态。引导条件状语从句,用一般现在时代替将来时。 这个是学过的最简单的。。 if it doesn't rain tomorrow, we will go picnic.如果明天不下雨,我们去野炊吧。 2.if后可以接虚拟语气。 (1)第一种是与现在事实相反,if从句谓语用过去式或者were。 if i were you, i would go there alone.如果我是你,我会一个人去那里。(与现在事实相反,可惜现在我不是你啊。。) (2)第二种是与过去事情相反,if从句谓语用过去完成时:had+过去分词。 if he had studied hard, he would have passed the exam.如果他过去努力学习,他现在就已经通过考试了。 (3)第三种是与将来事实相反,if从句谓语用动词过去式,should +动词原形,或were to + 动词原形。 if i should do/were to do/did it, i would do it in a

different way.如果我做这个,我将会用另一种方法来做。 if条件句的时态if有两大用法,一个是译为一般的如果,一个是用作假设的如果 在 if 引导的条件状语从句中,如果从句谈论的是一个推测将来有可能发生的事实,主句用一般将来时态,从句用一般现在时态。一般译为如果,如: if it rains tomorrow,i won't go out. 如果 if 条件句谈论的是一个主观的意愿,则主句,从句大多用一般现在时态。一般译为如果,如: if you dont want to go out ,you can stay at home. if还有一个最重要的用法,用于虚拟句。表示对不可能发生的事物的一种猜测或假设的语气。 "if"条件状语从句中的虚拟语气的结构如下表: 虚拟类型从句主句 对现在情况的假设一般过去时would+动词原形 对将来情况的假设一般过去时would+动词原形 对过去情况的假设过去完成时would + have + 过去分词 一、对现在情况的假设 主要表示对不可能发生或不太可能发生的现在情况的假设,例如: if i were you ,i would not tell him.如果我是你,我不会告诉他。 二、对将来情况的假设 if i had enough time, i would certainly go.如果我有足

英语中的常见六大疑问词的用法28732

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英语名词用法总结

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八年级英语上册_Unit_10_if_条件状语从句的时态练习

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if条件句和should的用法

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英语中形容词的用法学习资料

英语中形容词的用法

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由两个或两个以上的词组成的形容词词组修饰名词时须放在名词之后。 This is the book easy to read. 这是一本容易读的书。 用 and 或 or 连接起来的两个形容词作定语时一般把它们放在被修饰的名词后面。起进一步解释的作用。 Everybody, man and woman, old and young, should attend the meeting. 每一个人,男女老少,都应该参加会议。 You can take any box away, big or small. 这些箱子,不管大小,你都可以拿走。 比较级和最高级 绝大多数形容词有三种形式,原级,比较级和最高级,以表示形容词说明的性质在程度上的不同。 形容词的比较级和最高级形式是在形容词的原级形式的基础上变化的。 分为规则变化和不规则变化。 规则变化 1)单音节形容词的比较级和最高级形式是在词尾加-er 和-est 构成。 great (原级) greater(比较级) greatest(最高级) 2)以-e 结尾的单音节形容词的比较级和最高级是在词尾加-r 和-st 构成。 wide (原级) wider (比较级) widest (最高级) 3)少数以-y, -er, -ow, -ble结尾的双音节形容词的比较级和最高级是在词尾加-er 和-est 构成。 clever(原级) cleverer(比较级) cleverest(最高级) 4)以-y 结尾,但-y 前是辅音字母的形容词的比较级和最高级是把-y 去掉,加上-ier 和-iest 构成.

英语名词的用法及练习_完整整理版本

名词: 1、英语名词可分专有名词和普通名词两类: a、专有名词是个别的人、地、物、团体、机构等的专用名称。专有名词中实词的第一个字母要大写。如:Beijing, Tom, the People’s Republic of Chin a(中华人民共和国) 专有名词如果是含有普通名词的短语,则必须使用定冠词the。如:the Great Wall(长城) 姓氏名如果采用复数形式,则表示该姓氏一家人(复数含义),如:the Greens( 格林一家人)。 b、普通名词是许多人或事物的共有名称。如:pupil, family, man, foot.

普通名词又分为可数名词和不可数名词。 ▲可数名词是可以用简单的数词进行计数的名词,如: box, child, orange; ▲不可数名词是不可以用简单的数词进行计数的名词。如:water, news, oil, population, information . 2、英语可数名词的单复数:英语可数名词有单数和复数两种形式。 复数形式通常是在单数形式后加词尾“-s”构成,其主要变法如下: (1)一般情况在词尾加-s,例如: book→books,girl→girls,boy→boys, pen→pens,doctor→doctors, boy→boys。

(2)以s,x,ch,sh,结尾的词加-es,例如:bus→buses,class→classes, box→boxes,watch→watches, brush→brushes。 (3)以ce, se, ze,(d)ge结尾的名词加s,例如:orange—oranges。 (4)以辅音母加y结尾的词变“y”为“i”再加-es,例如:city→cities, factory→factories, country→countries, family→families。但要注意的是以元 音字母加y结尾的名词的复数形式 只加s,如:boy→boys, day→days。(5)以o结尾的词多数都加-es。例 如:hero→heroes,potato→potatoes,

新目标八年级上册英语unit if条件状语从句专项练习

if 条件状语从句的时态练习 观察与思考:观察1a中含有if的句子,你发现主句和从句的特点吗?if引导的是一个条件句,主句用__________(时态),从句用__________(时态)。注意:在与if条件句连用的主句中我们一般用will 表示将来时,而不用be going to 表示将来时。 (1) if引导的条件句位置灵活,可直接放在主句后面。若if引导的从句在前时,应在句中加__________(标点符号)。 (2) 如果if条件句谈论的是今后可能出现的情况,则主句大多用_______时;若if条件句谈论的是客观事实,则主句大多用_________时或含情态动词的句子。 (3) 在if条件句中通常用________时代替一般将来时表将来。 一.单项选择(15分) ()1.If you _____ to the party, you’ll have a great time A. will go B. went C. go D. going ()2. It will be a long time ____ Peter _____ his work. A. since, has finished B. after, finishes C. when, will finish D. before, finishes. ()3. What will father _____ us from Japan? A. take B. bring C. carry D. make ()4. Weifang is famous ______ kites A. for B. to C. on D. with ()5. I ____ her the answer if she ____me. A. can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks ()6. – What are you going to do tomorrow? --We’ll go to the library tomorrow if it ___. A. isn’t rain B. rain C. won’t rain D. doesn’t rain ()7.—Do you know when he will come back tomorrow? --Sorry, I don’t know. When he ____ back, I’ll tell you. A. comes B. will come C. come D. may come ()8. What will you do if you _____ to the old folk’s home visit? A. go B. went C.going D. will go ()9. If I eat ____ food, I’ll be very fat. A. too many B. many too C. too much D. much too ()10. I’ll give the book to him if he ___ here next Sunday. A. will come B. comes C. is coming D. came ()11. There ____an English film in our school tomorrow. A. is going to have B. will have C. is going to be D. has ()12. Could you tell us where ____? A. will the next Olympic Games held B. the next Olympic Games will be held C. would the next Olympic Games be held

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。

英语中名词的用法

一、英语中各种词性得用法及解释 1、名词 名词可以分为专有名词(Proper Nouns)与普通名词 (mon Nouns)。 专有名词就是某个(些)人,地方,机构等专有得名称,如Beijing,China等。 (不就是专有名词就就是普通名词) (1)名词变复数得方法 1)规则得变复数得方法 ①以o 结尾得名词,变复数时: a、加s,如: photo---photos piano---pianos radio---radios zoo---zoos; b、加es,如:potato—potatoes tomato—tomatoes (基本规律:有生命性质得词在后面加es,否则加s) ②以f或fe 结尾得名词变复数时: a、加s, 如: belief---beliefs roof---roofs safe---safes gulf---gulfs; b、去f, fe 加-ves,如:half---halves knife---knives leaf---leaves wolf---wolves wife---wives life---lives thief---thieves;

③名词复数得不规则变化 child---children foot---feet tooth---teeth mouse---mice man---men woman---women ④单复同形如:deer,sheep,fish,Chinese,Japanese 集体名词,以单数形式出现,但实为复数。 如: people police cattle 等本身就就是复数,不能说 a people,a police,a cattle,但可以说a person,a policeman,a head of cattle, the English,the British,the French,the Chinese,the Japanese,the Swiss 等名词,表示国 民总称时,作复数用。 ⑤以s结尾,仍为单数得名词,如: ⑥maths,politics,physics等学科名词,为不可数名词,就是单数。news 就是 不可数名词。 (2)名词得格 1)在英语中有些名词可以加"'s"来表示所有关系,带这种词尾得名词形式称 为该名词得所有格,如:a teacher's book。名词所有格得规则如下: 2) 单数名词词尾加"'s",复数名词词尾没有s,也要加"'s",如the boy's bag 男孩得书包,men's room 男厕所。 3) 若名词已有复数词尾-s ,只加"'",如:the workers' struggle工人得斗 争。 4)凡不能加"'s"得名词,都可以用"名词+of +名词"得结构来表示所有关系,如:the title of the song 歌得名字。 5)在表示店铺或教堂得名字或某人得家时,名词所有格得后面常常不出现它所修饰得名词,如:the barber's 理发店。 6)如果两个名词并列,并且分别有's,则表示"分别有";只有一个's,则表示'共有'。 如:John's and Mary's room(两间)John and Mary's room(一间)

总结好的:if引导的条件状语从句

if引导的条件状语从句 if 1) 用法: (1)条件状语从句通常由连词if引导,意为“如果、假如”,主句不能用be going to表示将来,而应该用shall,will。 If you leave now, you are never going to regret it. (错误) If you leave now, you will never regret it. (正确) (2)if “如果”,引导条件状语从句,主句用一般将来时,从句则用一般现在时,如: If it rains tomorrow, I shan’t climb the hills. (3)另外,主句是祈使句或含有情态动词,从句也用一般现在时。如: Please call me if he comes next Sunday. Can you call the policeman if you are in the trouble. 注意宾语从句中的if与条件状语从句if的区别。宾语从句中的if“是否”相当于whether,引导宾语从句,时态需根据语境确定。如果主句用一般现在时,从句可以根据具体情况选用时态,如果主句用一般过去时,从句必须用过去式的某种形式。 I don't know if it will rain tomorrow. 我不知道明天是否会下雨。 Our teacher said there was going to be a football match the next month.我们说下月将有场足球比赛。 【边学边做】用括号内所给词的正确形式填空。 1. What will you buy if you ________(have)a lot of money? 2. If it ________(not snow)tomorrow, we will feel unhappy. 3. You mustn’t go to school if you ________(be)still in bed. 4. If he _______(be)at home at that time, he would know it. 5. Please show me the way if you ________(know)it. 6. You will hurt your teeth if you ________(eat)too much candy. 7. If you gave me a toy car, I _________(be)very happy. 8. I would get the prize if I _________(work)hard. 9.If she ______ (finish ) work early ,she ______(go) home. 10.If the weather______(be)fine,we_______(go)for a walk .

英语中各种词性的意义及用法

英语中各种词性的意义及用法 1、名词,Nouns (n.) 表示人或事物的名称的词,按意义分类 ①专有名词 表示具体的人,事物,地点,团体或机构的专有名称(第一个字母要大写)。例:China(中国)、Asia(亚洲)、the People’s Republic Of China(中华人民共和国)。 专有名词如果是含有名词短语,则必须使用定冠词the。如:the Great Wall(长城)。 姓氏名如果采用复数形式,则表示该姓氏一家人(复数含义)。如:the Greens(格林一家人)。 ②普通名词 表示某些人,某类事物,某种物质或抽象概念的名称。如: box, pen,tree,apple按是否可数分类 名词又可分为可数名词(Countable Nouns)和不可数名词(Uncountable Nouns) ①不可数名词 不可数名词是指不能以数目来计算,不可以分成个体的概念、状态、品质、感情或表 示物质材料的东西;它一般没有复数形式,只有单数形式,它的前面不能用不定冠词 a / an。抽象名词,物质名词和专有名词一般是不可数名词。 ②可数名词 可数名词是指能以数目来计算,可以分成个体的人或东西,因此它有复数形式。 2、代词,Pronouns (pron.)代替名词、数词、形容词的词,大多数代词具有名词和形 容词的功能。英语中的代词,按其意义、特征及在句中的作用分为:人称代词、物主代 词、指示代词、反身代词、相互代词、疑问代词、关系代词、连接代词和不定代词九种。 如:We, this, them, myself 3、动词,Verb (v.) 表示动作或状态的词,如:Jump,sing,visit,它又分为及物动 词和不及物动词两大类: ①及物动词:字典里词后标有transitive verb(vt.)的就是及物动词。及物动词后 一般必须跟有动作的对象(即宾语)。必须加宾语意思才完整的动词,就是及物动词。 ②不及物动词:不及物动词是不需要受词的动词。字典里词后标有intransitive verb (vi.)的就是不及物动词。不及物动词后不能直接跟有动作的对象(即宾语)。若要跟宾 语,必须先在其后添加上某个介词,如to,of ,at等后方可跟上宾语。 ③系动词:联系动词或称不完全不及物动词,虽有意义,但不完全,需要加名词、形 容词、代名词等作主词补语以补足其意义。常和形容词连用构成系表结构的连系动词有: look (看起来,看上去), feel (感觉), taste (尝起来), smell (闻起来),get (变得),turn(变),become(成为,变得),sound (听起来)等。 例如: The weather gets warmer and the trees turn green in spring. 春天天气 变暖和了,树变绿了。 The flowers smell sweet. 这些花闻起来很香。 The soup taste nice. 这汤尝上去很好吃。

初中英语名词用法讲解

一、名词的分类 名词可分为普通名词和专有名词两大类。 1. 普通名词又可分为: (1)个体名词。如:cup,desk,student等。一般可数,有单复数形式。 (2)集体名词。如:class,team,family等。一般可数,有单复数形式。 (3)物质名词。如:rice,water,cotton等。一般不可数,没有单复数之分。 (4)抽象名词。如:love,work,life等。一般不可数,没有单复数之分。 2. 专有名词:如:China,Newton,London等。 二、名词的数 (一)可数名词的复数形式的构成规则 1. 一般情况下在名词的词尾加s,如:book books,pencil pencils. 2. 以-s,-x,-ch,-sh结尾的名词加-es,其读音为[iz]。如:bus buses,box boxes,watch watches,dish dishes等。 3. 以-y结尾的名词: (1)以“辅音字母+y”结尾的名词,把y改为i再加es,读音为[iz],如:factory factories,company companies等。 (2)以“元音字母+y”结尾的名词,或专有名词以y结尾,直接在词尾加-s,读音为[z]。如:key keys,Henry Henrys等。 4. 以-f和-fe结尾的名词: (1)变-f或-fe为v再加-es,读音为[vz]。如:thief thieves,wife wives,half halves等。 (2)直接在词尾加-s,如:roof roofs,gulf gulfs,chief chiefs,proof proofs等。 (3)两者均可。如:handkerchief handkerchiefs或handkerchieves. 5. 以-o结尾的名词:

八年级英语上册 if引导的条件状语从句作业 (新版)人教新目标版

精选doc if 引导的条件状语从句(作业)一、单项选择 ( )1. If you to the party, you’ll have a great time. A. will go B. went C. go D. going ( )2. I her the answer if she me. A. can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks( )3. —What are you going to do tomorrow? —We’ll go to the library tomorrow if it . A. isn’t rain B. rain C. won’t rain D. doesn’t rain ( )4. —Do you know when he will come back tomorrow? —Sorry, I don’t know. When he back, I’ll tell you. A. comes B. will come C. come D. may come ( )5. What will you do if you to the old folk’s home visit? A. go B. went C. going D. will go ( )6. I you up when he back. A. will wake; come B. will wake; comes C. wake; comes D. wake; will come 二、用所给词的适当形式填空 (be) fewer trees, there ( be) 7.If there more pollution. 8.If Marcia (live) alone, she ( keep) a pet dog. https://www.wendangku.net/doc/cd3358452.html,na (buy) a new dress if the old one (be) out of style. 10.If Mr. Green (say) I am hard- working, my parents _ ( feel) glad. (go) to the beach if it 11.I ( not rain) this week. 12.He (write) a letter to his grandparents if he (get) his report card this week.

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