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like this TV set. We must buy a new one. There was no more bus. They had to walk home. 表示“必須”這個意思時, must 和 have to 稍有區(qū)別。對過去發(fā)生的事情作肯定判斷用 must have done must do/be 現在肯定猜測 must have done 過去肯定猜測 can /could do/be 現在否定 ,疑問猜測 can /could have done 過去否定,疑問猜測 may/might do/be 現在肯定猜測 may/might have done 過去肯定猜測 如: We mustn’t waste our time. May I take this magazine out? No, you mustn’t. 注意 : must not : “禁止” 。 表示強制 /義務。 2. ______________________ eg: You must get up early. 你必須早起來。 should have done表示本該干卻沒干 shouldn’t have done表示本不該干某事而干了 。 用于表“ 意志 /決心 /請求 ”是情態(tài)動詞。 (表意愿) (表許可) shall和 should: 1. Perhaps I shall pay a visit to England this 。 Teacher wouldn’t allow it. 老師不會允許這件事。t you sit down? 請坐下,好嗎? 疑問句中用于第二人稱,提出請求 3. _____________________________________ Fish will die out of water. When I was at school, I would ask such questions. 表示習慣和傾向性 “總是” 4. _________________________ Would you help us, please? 請您幫助我們,好嗎? Yes , I will. 好的,我愿意。 would亦同理。m here? 請您告訴她說我在這兒,好嗎 ? (助動詞) (情態(tài)動詞) will是助動詞或是情態(tài)動詞 用于構成將來時是助動詞。比 can正式 :eg. I believe the man is from England. But I may be wrong. It’s too late. I think he may have gone to bed. 表示猜測“可能” D. _____________________ eg. May you succeed! May you have a good journey! 表示祝愿 。t