情態(tài)動詞

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

　　表特別有把握的肯定判斷時用must，表特別有把握的否定判斷時用can, can表判斷時只用在否定句中。因此把can 改為must。

　　42．He need come here before the meeting begins.

　　作情態(tài)動詞時need用在否定，疑問和條件句中，不能用于肯定句中，而作實意動詞時則可以。所以應改為：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 用來表示過去常常做某事而現(xiàn)在不了，所以應把后半句改為：but now he is not doing so.

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

　　由于情態(tài)動詞本身不體現(xiàn)時態(tài)，所以在談論過去的事情時在情態(tài)動詞后加 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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