來(lái)源:網(wǎng)絡(luò)資源 作者:中考網(wǎng)整理 2020-02-26 17:07:13
2.其否定形式mustn't表示“ 一定不要” 、“千萬(wàn)別”、“禁止,不許”。
You mustn't play with fire.你不許玩火。
You mustn't be late. 你一定不要遲到。
3.對(duì)must引導(dǎo)的疑問(wèn)句,肯定回答為must,否定回答為needn't或don't have to.
—Must I finish my homework?我現(xiàn)在必須完成作業(yè)嗎?
—No, you needn't.不,你不必。
4.must表示有把握的推測(cè),用于肯定句。
The light is on,so he must be at home now.燈亮著,他現(xiàn)在肯定在家。
5.注意其反意問(wèn)句的構(gòu)成形式:
當(dāng)must表示肯定的判斷、推測(cè)時(shí),其反意疑問(wèn)句要用實(shí)際問(wèn)句的助動(dòng)詞來(lái)構(gòu)成。
She must have seen the film before,hasn't she?(注意反意疑問(wèn)句的后半部分)
You must have met uncle Wang in the shop yesterday,didn't you? (注意反意疑問(wèn)句的后半部分)
need的用法
1.need表示需要、必須,主要用于否定句和疑問(wèn)句中,其否定形式為needn't,意為“沒有必要,不必”。
用need提問(wèn)時(shí),肯定回答為must,否定回答為needn't或don't have to。
—Need I stay here any longer? 我還有必要留在這兒?jiǎn)幔?br />
—Yes,you must.是的。
—No.you needn't /don't have to. 不,你不必。
2.need還可以作實(shí)義動(dòng)詞,此時(shí)有人稱、數(shù)和時(shí)態(tài)的變化,如果是人作主語(yǔ)后邊多接動(dòng)詞不定式。
I need to do it right now.我需要馬上做這件事。
He needs to learn more about the girl.他需要多了解那個(gè)女孩。
如果是物作主語(yǔ),一般用need doing與need to be done,這種情況下應(yīng)注意兩點(diǎn):
(1)主動(dòng)形式的動(dòng)名詞doing具有被動(dòng)的含義;
(2)該動(dòng)名詞可以改為其動(dòng)詞不定式的被動(dòng)形式而句子的意義不變。
The door needs painting.=The door needs to be painted. 那扇門需要油漆一下。
Your car needs mending.=Your car needs to be repaired. 你的車需要維修了。
dare的用法
dare意為“敢、敢于”, 用法近似于need,有兩種詞性:
1.dare 作為情態(tài)動(dòng)詞,多用于否定句、疑問(wèn)句或條件句中,無(wú)第三人稱單數(shù)形式,只有一般現(xiàn)在時(shí)和一般過(guò)去時(shí)。
Dare he tell them what he knows? 他敢告訴他們所知道的情況嗎?
I daren't ask her,will you do it for me? 我可不敢問(wèn)她,你能幫我問(wèn)問(wèn)嗎?
2.dare 作為實(shí)義動(dòng)詞,此時(shí)有人稱、數(shù)及時(shí)態(tài)的變化。
He doesn't dare to break his promise.他不敢食言。
注意:在口語(yǔ)中,dare 的各種形式常與不帶to 的不定式連用。
如:Do you dare tell her what I said?你敢告訴她我說(shuō)的話嗎?
I didn't dare look at him.我不敢看他。
shall的用法
shall表示征求對(duì)方意見(多用于第一、三人稱)。
如:Shall we go out for a walk? 我們出去散步好嗎?
在英語(yǔ)中,我們可以用其他多種方式提出我們的建議或征求對(duì)方意見。
1.用“Let's do...”來(lái)提出建議。
如:Let's go for a walk after supper.
2.用“What/How about...?”來(lái)提出建議;about后接名詞或動(dòng)詞ing形式。
如:What about/How about a drink? What about/How about taking Tom with us?
3.用“Why not...?”來(lái)提出建議,表示“何不……”not面后接動(dòng)詞原形。
“Why not...?”實(shí)際上是“Why don't you/we...?”的簡(jiǎn)略形式。
如:Why not meet at the school gate at eight? Why don't we stay here another day?
4.用“Would you like...?”來(lái)提出建議,意思是“你想要……嗎?”Would you like后可接名詞或不定式。
如:Would you like a cup of tea? Would you like to go and see her?
因此,如果我們說(shuō):“去游泳好嗎?”英語(yǔ)中可有這樣幾種表達(dá)法:
Shall we go for a swim?
Let's go for a swim,shall we?
What about/How about going swimming?
Why not go for a swim?
Would you like to go for a swim?
What do you think of going for a swim?
should的用法
1.should 意為“應(yīng)該”,可表示勸告、建議、義務(wù)、責(zé)任等。如:We should protect the environment. 我們應(yīng)該保護(hù)環(huán)境。
2.Should have done 表示對(duì)過(guò)去動(dòng)作的責(zé)備、批評(píng)。
如:You should have finished your homework.
你應(yīng)該已經(jīng)完成作業(yè)了。(事實(shí)上你沒有完成。)
will的用法
will表示意愿、意志、打算,可用于多種人稱。
如:I will help you if I’m free this afternoon.今天下午如果我有空,我就會(huì)幫你。
注意:1.will在there be句型中的形式及其句式變換。
由于“一般將來(lái)時(shí)”的結(jié)構(gòu)可以用“will+動(dòng)詞原形”來(lái)表示,所以there be句型的一般將來(lái)時(shí)的形式就是there will be。(一定不能說(shuō)there will have)
例如:There are many students in our school. →There will be many students in our school.
There will be a sports meeting next week. 一定不能說(shuō):There will have a sports meeting next week.
2.will 與be going to do sth區(qū)別:
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