【正文】
和have to都有“必須”的含義,它們的用法如下:(一)、 must “必須”、“應(yīng)該”的用法: 表示“必須”、“應(yīng)該”。例如:①We must protect our environment.(我們必須保護(hù)環(huán)境。)2. must的否定形式must not表示“不應(yīng)該”、“禁止”、“不準(zhǔn)”。例如:①You mustn’t speak like that.(你不應(yīng)該像那樣講話。),肯定形式用must來(lái)回答,但否定形式用needn’t 或don’t have to來(lái)回答。例如:①——Must I be home before 8 o’clock?(8點(diǎn)之前我必須回家嗎?) ——Yes, you must. No, you needn’t./No, you don’t have to. (是,你必須。),意思是“一定”、“必定”,一般只用于肯定句中。)②There must be some children in the room.(房間里準(zhǔn)有些孩子。)②He must be watching TV.(他準(zhǔn)是在看電視。)②I didn’t hear the phone. I must have been asleep.(我沒(méi)有聽(tīng)到電話,我準(zhǔn)是睡著了。)②We will have to get up early tomorrow.(明天我們必須早起。例如: ①I(mǎi)’ve got to leave for Nanjing.(我不得不去南京。Must一般只有現(xiàn)在時(shí),而have to有更多的形式。例如: ①We don’t have to go home. ①Do you have to go home? ②We haven’t got to go home. ②Have you got to go home?練習(xí):一、.Fill in the blanks using have to, have got to, must, should, ought to, had better. _____________ no