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如:Mr. Wang may know Professor Li’s telephone 。may not在否定句中常常譯為“可能不”。如:The man under the tree can’t be Tom. He’s gone to England. 這個(gè)人不可能是Tom,他已經(jīng)去英國(guó)了。 ②. can / could多用于否定句、疑問(wèn)句或感嘆句中表示推測(cè)、懷疑,兩者在時(shí)間上沒(méi)有差別。Cars mustn’t be parked here. 此處嚴(yán)禁停車。【注意】 must不表推測(cè)時(shí),在肯定句中意思為“必須(強(qiáng)調(diào)內(nèi)在的職責(zé))”,在否定句中意思為“不許、禁止”,以它開(kāi)頭的疑問(wèn)句否定回答常用needn’t或don’t (doesn’t) have to。如: You have worked hard all day. You must be tired. 你已辛苦工作一整天了,一定累了。7. 我們現(xiàn)在怎么做才好呢?Hadn’t we better tell her the truth? 你最好別再做那件事。 你最好睡一會(huì)兒。had better do sth意思是“最好做某事;還是做某事比較好”。 6. had better的基本用法:had better常略作’d better。 Does he need to go right now?We don’t need to work today. My watch needs mending/to be mended.即need to do sth;如果物作主語(yǔ),一般后用need to be done 或need doing sth。(而你卻買了)【注意】:—Need I/we……?—Yes,you must ./—No, you needn’t / don’t have to .⑵ need用作實(shí)義動(dòng)詞時(shí),有時(shí)態(tài)、人稱和數(shù)的變化。(你還沒(méi)買)You needn’t have bought the coat. 所以我不需要告訴他,對(duì)吧?請(qǐng)比較以下兩句話的不同意思:You needn’t buy the coat./不,不必?!狽eed we go so soon?例:I don’t believe you need worry.⑴ need用作情態(tài)動(dòng)詞時(shí),只用于否定句和疑問(wèn)句。Will he have to work deep into the night?I’ve got to go to a meeting.例:Sorry, I have to leave now.例:I / You / We / They have to…. He / She / It has to…. You don’t have to….Does she have to…?have to =have got to,意思是“必須,不得不”。4. have to的基本用法:have to可視為情態(tài)動(dòng)詞,但它與其他情態(tài)動(dòng)詞在用法上稍有不同。You must be Mr. Jones.He is good at English. He must know the word.例:She didn’t look at me. She must be angry.—No, you .也就是:—Must I/we do it now?—Yes, you must . —No, you needn’t /don’t have to . You must be here by ten o’clock.3. must的基本用法:⑴ 表示必須,強(qiáng)調(diào)說(shuō)話人的主觀意志。 那會(huì)是真的嗎?Who can he be?注意:如果在疑問(wèn)句中表示“可能”,通常用can。The news may not be true.例:It may rain tomorrow.(mustn’t表示明確的禁止。 我可以在這里抽煙嗎?—No, you mustn’t.(may not表示按規(guī)定不許可,如果用mustn’t則表示說(shuō)話人不許可。You may not pick flowers in this park. 例:You may / can e if you wish. 你可以幫我做飯?!覀兛梢哉?qǐng)露茜幫忙試試看。 下周我們可以再見(jiàn)面嗎?—What shall we do?在這里,也可用could使語(yǔ)氣婉轉(zhuǎn)。 The news can’t be true.例:What can he possibly want? 在否定句中,否定形式can’t表示推測(cè)“不大可能”。 You can’t keep the library books for more than a month. — No, you can’t. ⑵ 表示許可,主要用于口語(yǔ),書面語(yǔ)一般用may。 如果表示將來(lái)具備的能力,要用will be able to。 —Can you play basketball?【情態(tài)動(dòng)詞的基本用法】1. can的基本用法:⑴ 表示體力或智力上的能力,即“能夠,會(huì)”,可與be able to轉(zhuǎn)換。⑶ 在意義上,情態(tài)動(dòng)詞具有“多義性”。它們具有以下特點(diǎn):⑴ 它們必須與其他動(dòng)詞連用,即:情態(tài)動(dòng)詞+動(dòng)詞原形表示說(shuō)話人對(duì)所述動(dòng)作的看法,如需要、可能、意愿或懷疑等。few后接可數(shù)名詞,little后接不可數(shù)名詞。情態(tài)動(dòng)詞一、 考點(diǎn)、熱點(diǎn)回顧【詞匯辨析】1. sometimes/ some times/sometime/ some time: sometimes: “有時(shí)”=at times. He is sometimes