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⑵ 肯定句中表示推測,“可能”。例:It may rain tomorrow. 明天可能會(huì)下雨。The news may not be true. 這個(gè)消息可能不會(huì)是真的。注意:如果在疑問句中表示“可能”,通常用can。例:Can it be true? 那會(huì)是真的嗎?Who can he be? 他究竟是誰呢?⑶ 【注意】:—May I/we……?—Yes, you may./—No, you mustn’t.3. must的基本用法:⑴ 表示必須,強(qiáng)調(diào)說話人的主觀意志。例:I must go now, or I’ll be late. You must be here by ten o’clock. 【注意】:表示“必須“時(shí),must的否定式為needn’t ,或don’t have to ,而不是mustn’t。也就是:—Must I/we do it now?—Yes, you must . —No, you needn’t /don’t have to .例:—Must I go with them?—No, you . ⑵ 表示推測,一般只用于肯定陳述句,表示非??隙?。例:She didn’t look at me. She must be angry. 她不朝我看,一定是生氣了。He is good at English. He must know the word. 他英語好,準(zhǔn)知道這個(gè)詞。You must be Mr. Jones. 想必您就是瓊斯先生吧。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。其他情態(tài)動(dòng)詞沒有人稱和數(shù)的變化,而have to卻有人稱和數(shù)的變化,要視主語的不同而變化。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”。和must不同之處:must強(qiáng)調(diào)主觀需要have to強(qiáng)調(diào)客觀需要。例:Sorry, I have to leave now. 對(duì)不起,現(xiàn)在我得走了。I’ve got to go to a meeting. 我得去參加一個(gè)會(huì)議。Will he have to work deep into the night? 他將不得不工作到深夜嗎?5. need的基本用法:need的基本詞義是“需要”,它既可作情態(tài)動(dòng)詞,又可作實(shí)義動(dòng)詞。⑴ need用作情態(tài)動(dòng)詞時(shí),只用于否定句和疑問句。它只有一種形式,后接動(dòng)詞原形。例:I don’t believe you need worry. 我相信你沒有必要焦急?!狽eed we go so soon?我們需要這么早就去嗎?— Yes, we must. / No, we needn’t.是的,必須。/不,不必。So I needn’t tell him, need I? 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. 你沒有必要買那件外衣。(你還沒買)You needn’t have bought the coat. 你沒有必要買這件外衣的。(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。如果人作主語,一般后接帶to的動(dòng)詞不定式。即need to do sth;如果物作主語,一般后用need to be done 或need doing sth。例如:I need to look up this word in the dictionary. My watch needs mending/to be mended. 我的手表需要修理了。We don’t need to work today. (= We needn’t work today.) Does he need to go right now? (= Need he go right now?) 6. had better的基本用法:had better常略作’d better?,F(xiàn)代語法認(rèn)為它是一個(gè)助動(dòng)詞,因?yàn)樗蠼硬粠o的動(dòng)詞不定式。had better do sth意思是“最好做某事;還是做某事比較好”。例:You’d better get some sleep. 你最好睡一會(huì)兒。You’d better not do that again. 你最好別再做那件事。What had we better do now? 我們現(xiàn)在怎么做才好呢?Hadn’t we better tell her the truth? 我們是否最好不告訴她真相?【注意】:You’d better….表示勸告或委婉的命令,對(duì)長輩不宜使用。7.could, should, would, might表示推測:①. must多用于肯定句中表示把握性極大的推測,意思為“一定、肯定”。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。The book must be his. His name is on the cover. 這本書一定是他的,封面上寫著他的名