英语四级语法：模样形状动词must详解篇
1、must默示必需，否定回答时用needn‘t. mustn’t默示不允许。
「例如」You must get to the station before 3， otherwise you will miss the train.Must I hand in my homework tomorrow？
No， you needn‘t. You can turn it in the day after tomorrow.
You mustn‘t smoke in the hospital.
2、must用于一定句，可以默示料到，翻译为：一定或想必。背面接动词的通俗时，默示对现在的料到，接动词的完成式，默示对过往的料到。对过往的料到是测验的重点。「例如」：
She must live near here， for she comes to work on foot.
She was absent from class. There must have been something wrong with her.
The light was out. They must have gone to bed.
真题：Mary‘s score on the test is the highest in her class. She ____ have studied very hard.（CET-4 1998.1）
A） may
B） should
C） must
D） ought to
“must +不定式完成式”默示对过往发闹事变的料到。题意为：玛丽的测验成绩全班第一，她学习一定很刻苦。谜底为C.
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