Therefore的用法

Therefore的用法

, 一、整句中时一般不放句末，句首后要有逗号，句中1、按一般副词使用2、做插入语（这两个分得清吧）

eg.1、Therefore，we must learn English well.

2、They therefore can learn English well.

3、Many fast food restaurant ,therefore,have red furniture or walls.

二、用在分句中，即一个句子一部分表示原因一部分表示结果。

这时一般词前要用分号，其后用不用逗号无所谓。若第二个分句前是逗号或无符号，则要注意therefore是副词，和so不一样，要保持句子完整，应用and therefore。

eg.1、I had a headache;therefore I could not go to your party.

2、I was ill,and therefore could not come.

3、These birds are very beautiful and therefore liked by many people. However的用发

1. 用作副词

(1) 表示让步：意为“无论如何”“不管怎样”，用来修饰形容词或副词，

其词序为：however+形容词或副词+主语+谓语。这样用的however其实具有连词的功能，用以引导让步状语从句。如：

however much he eats, he never gets fat. 不管他吃多少，他永远吃不胖。

用于此用法时，请注意以下几点：

①此用法属however所有用法中最重要的考点，同学们务请引起高度重视。

②这样用的however 与no matter how 大致同义。如：

People always want more, however [no matter how] rich they are. 人总是富了还想再富。

however [No matter how] hard I worked, she was never satisfied. 无论我多么努力地工作，她从来没满意过。

③有时从句谓语可用情态动词。如：

Don’t laugh, however funny it may be. 无论多么有趣也不要笑。

I’ll try to finish i t in time, however hard it may be. 无论多么难，我也要按时完成。

④“however＋形容词或副词＋主语＋谓语”有时可以有所省略。如：

I refuse, however favorable the conditions. 不管条件如何有利，我都不干。(conditions后省去了are)

I’d rather have a room of my own, however small (it is), than share a room. 无论房间多么小，我宁愿一个人住一间，而不愿意与别人合住一个房间。

A grammar rule, however true (it is), is useless unless it can be understood. 一条语法规则，不管如何正确，除非能懂，否则毫无用处。

(2) 表示转折：尤其用于谈及一个既成事实时，表示转折，其意为“可是”“仍然”等。可放在句首、句中或句末，通常用逗号与句子其他成分隔开。如：

My father, however, did not agree. 但是，我父亲不同意。

M y room is small; however, it’s comfortable. 我的房间很小，但却很舒服。

He said that it was so; he was mistaken, however. 他说情况如此，可是他错了。

注：however不能像but(但是)那样直接连接两个句子(注意正句中的标点符号)。如：

我们都已尽了最大的努力，不过我们还是输了。.

正：We all tried our best, but we lost the game.

正：We all tried our best; however, we lost the game.

正：We all tried our best. however, we lost the game.

(3) 表示惊奇或强调：相当于how ever的用法，其意为“究竟怎样，到底以什么方式”。如：

however did you get here without a car? 没有汽车你究竟是怎样来的呢?

But的用法

but是转折，带有非常浅的转折和递进义在里面，以至于几乎可以省略，或者使用while替代

首句描述母亲动作，次句是人物的状态

首句正常描述，次句揭示问题，引出下文。文学作品里的词语活用很常见，不用钻牛角尖

Through 的用法

Through 的用法 （一）作介词 (1) 从…中通过;贯穿,穿过(强调丛物体内部或一定范围内),透过 We started to push our way through crowds of children、 The River Thames flows through London、On our way we had to pass through Hudson Street、 The sunlight was coming in through the window、The sound echoed through the hall、(2)通过,凭借(方法手段),经由 He became rich through hard work and ability、 We learn to speak through speaking、He got the job through his uncle、 (3)由于,因为…的关系 He failed through lack of experience、 (4)自始至终;从头到尾/底 The children are too young to sit through a long concert、 We worked through the night、 (5)经受;经历 That was a small matter after the Cultural Revolution they had been through、辨析:through ,across ,over (复习) The Great Wall winds its way from west to east, _______ deserts, _______ mountains, ______ valleys, till at last it reaches the sea、 Go _______ the bridge _______ the river, and you will find the shop、 I have made friends right ________ the world、 The crowd of people walked past the City Hall to the Center Square、 Through & by 表示“通过”时,through 后常加名词表示手段媒介,而by 后常加工具具 体名词以及-ing 形式。 He got that job through his uncle、 You can succeed by working hard、I sent the letter by airmail、 (二) 作副词 (1) 通过,过去(可与许多动词连用) The flood is too deep to drive through、 (2) 彻底地;接通电话 Don’t tell me how it ends---I haven’t read it through、 You’re through to London, sir! (三) 常见搭配 Get through ①通过;度过 He got through his examinations、 ②做完;吃完;饮完 We managed to get through the work in four hours、

祈使句的构成和用法

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初中语法祈使句专项讲解

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【精选】turn 用法

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祈使句语法

祈使句的常见用法 几种形式： 1. 肯定祈使句（谓语动词用动词原形）。 Be careful!小心！ 2. 否定祈使句（在谓语动词前加Do not / Don't / Never）。 Don't open the door. 不要开门。 3. Let开头的祈使句（Let's / Let sb +动词原形）。 Let me have a try. 让我试试吧。 4. “No +名词或动名词”也可以构成祈使句。用于“指示标牌、布告”等，意为“禁止、不许”。 No spitting!不准随地吐痰！ No admittance except on business! 非公莫入！ 5. 无动词祈使句。有些用于口号、告示的祈使句不用动词，使语言更加简洁明了。如： After you! 您先请！ Bottoms up! 干杯！ 注意： 1. 祈使句一般不出现主语you。但是，为了加强语气或要特别指明向谁提出命令或要求时，需加主语you，有时还可以同时加称呼语。如：Tom, you water the flowers! 汤姆，你浇花！ Come in, everybody! 大家都进来！ 2. 祈使句后也可加简略问句，不表示反义，而是表示语气。如： Show me how to use this water pump, won't you? 教我怎样使用这台抽水泵，好吗？Let's make sure the lights are turned off and the door is locked, shall / shan't we? 让我们核实一下是否关灯和锁门了，好吗？ Let me tidy the lab instead of you, may I? 我替你收拾实验室，好吗？ 3. 祈使句也可用于表示祝愿。如： Wish you a good journey. 祝你旅途愉快。 Allow me to propose a toast to our friendship!为我们的友谊干杯！

reason的用法小结

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considered entering the wholesale broadband market in the first place still holds、 b、关系代词充当定语从句的主语或宾语,可以用that或which,与一般的定语从句用法相同。 What is the reason that he gave for this? What was the reason which led the slaves to leave the estates in British Guiana? 2) reason+同位语从句,用that引导。 We decided against installing new heating apparatus, for the reason that it would be too costly、 ——《用法词典》 She didn’t answer for the simple reason that she couldn’t think of anything to say、- Longman 2 reason + for/of/to(小品词) His reason for going back to school is to learn new things、- nhd、heinle、com People give many different reasons for wanting to change jobs、– Longman

祈使句的用法讲解

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lack用法

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Let her do what she likes. 让她做她想做的事吧。 Let the meat cook slowly. 把肉用慢火炖。 Let XYZ be a triangle. 设XYZ为一个三角形。 Let the two lines be parallel. 假设两条线是平行的。 Let every man do his best. 让每个人人尽其才。 Let him have his own way. 让他照自己的意思做吧! Let the true cause of the accident be published. 把造成这件意外的真正原因公开吧。 Let him try that game again on me, and I’ll soon put paid to it. 他如若再和我玩这把戏，我很快就会叫他收起来。 let后接there be句式 "Let there be no reprisals,” said the widow of the murdered man. 被害者的遗孀说：“千万不要搞复仇。” Let there be light. 让地上有光。 Let there be no doubt in your minds about our intentions. 对于我们的意图，你们心里不要有疑问。

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