must表示主观意志,而have to表示由于客观因素不得不做某事。must没有过去式,除在间接引语中可用于表示过去时间,在直接引语中表示过去时间应该用had to代替。
I told her that she must give up smoking. 我叫她必须戒烟。
We had to get everything ready that night. 我们那晚得把一切准备就绪。"
3. would和used to
1)used to表示过去与现在或过去某时与后来的情况有不同,而would只表过去的情况。
People used to think that the earth was flat.
过去人们认为地球是平的。(现在人们不这么认为。)
She would go out for a walk in the morning when she was in the country.
在乡下时,她总是在早晨去散会儿步。(可能现在仍有散步的习惯。)
2)used to可表示过去的习惯动作和经常的情况,而would只表示过去的习惯动作。
He used to ∕would smoke while writing. 过去他写东西时常抽烟。
She used to be fat. 她过去很胖。
◆ 考题剖析
例题1. I didn't hear the phone. I ________ asleep. (NMET 89)
A. must be B. must have been C. should be D. should have been;
答案 B 从原题中的I didn't hear the phone.这一信息可以判断出,用must have
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