广州自考英语复习要点：常用情态动词英语语法
1．情态动词无人称变化，在句子中和动词原形一起组成谓语。只有ought后面接to do。
情态动词后接完成时的用法:情态动词用来表示能力、允许、许诺、可能、必须、劝告、意愿等概念或态度。
2．must＋现在完成时结构：这一结构表示对过去一个动作比较有把握的猜测。
例：I believe he _____ an accident, otherwise he would have arrived on time.
A. would have had B. could have had
C. should have had D. must have had
3．should (ought to )have done本来应该做却没有做某事。
例：I’m sorry I couldn’t get in touch with him before he left, I _____ him earlier.
A. had a telephone B. have phoned
C. should have phoned D. should be phoned
中文意思是“我很抱歉我没能在他走之前和他联系上，我本应早点儿给他打电话的。”
4．could＋现在完成时，本来能做的事情而没有做。
例：Mary _____ that coat, but she chose to lend the money to a needy neighbor.
A. could have bought B. must have bought
C. can buy D. could buy
中文意思是: 玛丽本来可以买那件大衣的，但是她把钱借给一个更急需的邻居了。
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