情态动词

　　41．He can be at home now because the light in his room is still on.

　　表特别有把握的肯定判断时用must，表特别有把握的否定判断时用can, can表判断时只用在否定句中。因此把can 改为must。

　　42．He need come here before the meeting begins.

　　作情态动词时need用在否定，疑问和条件句中，不能用于肯定句中，而作实意动词时则可以。所以应改为：He needs to come here before the meeting begins.

　　43．He used to get up very early in the morning, and now he is still doing so.

　　used to 用来表示过去常常做某事而现在不了，所以应把后半句改为：but now he is not doing so.

　　44．I needn’t come yesterday because all the work had been finished.

　　由于情态动词本身不体现时态，所以在谈论过去的事情时在情态动词后加 have done，因此在 needn’t 后加have。

　　45．You hadn’t better stay up too late because you have to get up early tomorrow.

　　had better 的否定在 better 后面加not.
 

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