陷阱四：形式上是考查非谓语动词，但实质上是考查祈使句

1. Mary, ______ here — everybody else, stay where you are. (2006全国I)

A. come                   B. comes               C. to come               D. coming

【解析】答案选A。此处考查祈使句的用法，故用动词原形。

2. —What should I do with this passage?

— _____the main idea of each paragraph. (2005重庆卷)

A. Finding out            B. Found out          C. Find out             D. To find out

【解析】答案选C。此处考查祈使句的用法，故用动词原形。其实，此题也可视为You should find out…之省略。

陷阱五：形式上是考查非谓语动词，但实质上是考查并列句

1. At last, we found ourselves in a pleasant park with trees providing shade and _____down to eat our picnic lunch. (2005上海卷)

A. sitting                    B. having sat             C. to sit              D. sat

【解析】答案选D。由句中的and可知，此句为并列结构，且空格处填sat，与其前的谓语动词found并列。

2. _____ many times, but he still didn’t understand it.

A. Having been told                                    B. Though he was told

C. To have been told                                  D. He was told

【解析】答案选D。句中的并列连词 but 表明整个句子为并列句，同时表明but前应是一个独立的句子，而不能是一个非谓语动词短语(所以不能选A或C)，又因为though为从属连词，用以引导让步状语从句，它与连接并列句的并列连词 but 不“兼容”，所以也不能选B (from www.nmet168.com)。

3. First ______ the rice by washing it, then ______ it in boiling water.

A. prepare, cook                                        B. preparing, cooking

C. preparing, cook                                     D. prepare, cooking

【解析】答案选A。题干部分为两个并列的祈使句，故均用动词原形。

【实战训练】

1. “I’d like to take a week’s holiday.” “______ it, we’re just too busy.”

A. Forget                B. Forgetting          C. Forgets            D. Forgot

2. —Then let’s have fish, beef with tomatoes and a soup. OK?

—______ nice.

A. Sound                 B. Sounded           C. Sounding          D. Sounds

3. Stanley, ______ hello to your nephew.

A. come and say                                   B. comes and says

C. to come and say                               D. coming and saying

4. If there’s no reply at the front door, ______ round the back

A. come                   B. comes              C. to come             D. coming

5. Don’t stand out there in the cold—______ in here and get warm.

A. come                   B. comes              C. to come             D. coming

6. Before you send the letter, ______ with Bill to see if the address is right.

A. check                  B. to check            C. checking           D. checked

7. Before you decide to leave your job, ______ the effect it will have on your family.

A. consider               B. considering        C. to consider        D. considered

8. If you hear the fire bell, ______ cool and don’t panic.

A. keep                     B. to keep             C. keeping              D. kept

9. If you can’t get in the front door, ______ to the back door.

A. go                        B. to go                C. going                 D. to be going

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