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stn’t(禁止,不準(zhǔn)),而用needn’t, don’t have to(不必). Must we hand in our exercise books today? Yes, you must. No, you don’t have to / you needn’t. 2) must是說話人的主觀看法, 而have to則強調(diào)客觀需要。Must只有一般現(xiàn)在時, have to 有更多的時態(tài)形式。 1. he play isn’t interesting, I really must go now. 2. I had to work when I was your age. 3) 表示推測、可能性(只用于肯定的陳述句) 1. You’re Tom’s good friend, so you must know what he likes best. 2. Your mother must be waiting for you now. 四、 dare, need 1) dare作情態(tài)動詞用時, 常用于疑問句、否定句和條件從句中, 過去式形式為dared。 1. How dare you say I’m unfair? 2. He daren’t speak English before such a crowd, dare he? 3. If we dared not go there that day, we couldn’t get the beautiful flowers. 2) need 作情態(tài)動詞用時, 常用于疑問句、否定句。在肯定句中一般用must, have to, ought to,