高一英语专题之短语区别

高一英语专题之短语区别must, have to和have got to的区别,小编整理了相关资料,以供参考:一、must的用法1)表示主观的义务和必要, 主要用于肯定句和疑问句, 意思为“必须……,得……,要……”;由must引起的疑问句,肯定回答要用must或have to,否定回答要用needn’t或don’t have to, 意思是“不必”;must的否定形式mustn’t表示禁止,意思是“不能,不许”。如:We must find a good method to learn computer well.我们必须找一个学好电脑的方法。—Must I finish the task right now?我现在必须完成这个工作吗?—Yes, you must. / Yes, you have to. 是的。(—No, you needn’t. / No, you don’t have to. 不,不必。)You mustn’t come here without permission. 未经允许,你不能来这儿。2)表示肯定的猜测,常用于肯定句中,意思为 “一定是, 必然……”。注意must表示推断或猜测的几种情况:Your sister must be a doctor in this hospital. (现在的猜测)你姐姐一定是这家医院的医生。He must be reading newspapers in the reading room now.(正在进行的猜测)他此刻一定正在阅览室读报。It must have rained last night, for the ground is wet. (过去的猜测)昨晚一定下雨了,因为地面上是湿的。二、have to / have got to 的用法1)must表示一种主观的需要,而have to表示一种客观的需要,意思是“不得不”。 如:I have to attend an important meeting this afternoon.今天下午我不得不参加一个重要的会议。Mother is out, so I have to look after the shop.妈妈不在家,因此我不得不照看商店。2)have to 的否定形式是don’t have to, 相当于needn’t。如:They don’t have to buy a computer at present.他们目前没有必要买电脑。3)have to 与have got to 常可以互换。三、巩固练习:从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。1. Mike, you ______ play with fire. You______ burn yourself.A. won’t; can’t B. mustn’t; mayC. don’t have to; must D. have got to; shouldn’t2. You ______ see the doctor, Joe. You don’t look very well.A. must B. shallC. may D. can3. —Must I clean the window now?—No, you ______.A. mustn’t B. needn’tC. can’t D. may not4. Jack’s ill, so they ______ change their plans.A. must B. shouldC. have got to D. ought to5. Harry has been reading all day —he ______ be tired.A. should B. has got toC. has to D. mustKey 1: 1-5 BABCD