11. 情態動詞后何時接一般式, 何時接完成式

The plant is dead. I ______ it more water.

A. should give           B. should have given  C. must give              D. must have given

此題應選 B。從句意上看, 植物既然已死了, 那么后句的意思應該是：本來應該多澆水, 但卻沒有多澆水(這是一種遺憾), 所以只能選B。

談論現在的情況, 情態動詞后接動詞原形：談論已經發生的情況或本來應該發生但卻沒有發生的情況等, 情態動詞后要接動詞的完成式。請做以下各題：

1. Jenny ____ have kept her word, I wonder why she

changed her mind.

A. must                    B. should                  C. need                     D. would

2. We ____ last night, but we went to the concert

instead.

A. must have studied                                  B. might study

C. should have studied                               D. would study

3. He should not ____ me your secret, but he meantno harm.

A. have told                                               B. tell

C. be telling                                               D. having told

4. I told Sally how to get here, but perhaps I____ it out for her.

A. had to write                                          B. must have written

C. should have written                               D. ought to write

答案：1. B 2. C 3. A 4. C

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