【练习】

1. Taking this medicine, if _____(continue) , will of course do good to his health. (填空练习)

答案:continued

解析:if continued 是“if taking this medicine is continued”的省略形式。

2. In the face of the big fire in October in California, many people in the fire-stricken areas moved out  _____(escape ; burn)   (填空练习)

答案: to escape being burned不定式作目的状语。

解析: escape 意为“逃脱”,不接不定式,而常接-ing形式作宾语。只能接-ing形式作宾语的动词还有:mind, admit,avoid,appreciate,consider(考虑), delay, imagine,miss,practice等。

3. O'Neal works hard.He is often seen ___heavily before his teammates start.

A.sweated   B.to be sweated   C.sweating   D.being sweated

答案:C

解析:分词在句中作主语补足语。因sweat这一动作是he所发出,所以为主动。

4. I remained _______ long after I had been told the story.

A. puzzling   B. puzzled     C. being puzzled    D. to be puzzled

答案: B

解析:  puzzled 表主语感到迷惑不解的,puzzling 表令人迷惑不解的,beingpuzzled强调正在进行的被动动作,to be puzzled表在主句谓语之后发生。

5. I can hardly imagine Peter_______ across the Atlantic Ocean in 15 days.

A.sail   B.to sail   C.sailing   D.to have sailed

答案: C

解析: Peter为逻辑主语,与sailing构成复合结构,作imagine的宾语。

6. I _____(drive) along the quiet road at forty miles an hour, and then an old man suddenly started to cross the road in front of me.  (填空练习)

答案:was driving

解析: 因句中有连词and,所以and 之前必须是一个并列关系的分句。

【小知识】复合结构动词不定式

复合结构不定式:由for + 名词(或代词宾格)+ 动词不定式即构成复合结构的动词不定式。

其中for本身无意义。for后面的名词或代词是不定式的逻辑主语,这种不定式在句中可作主语、表语、宾语、定语或状语,如:It is very important for us to get everything ready for the harvest.

当作表语用的形容词表示不定式的逻辑主语的性质或特征时,就用介词of而不用for引出不定式的逻辑主语,这些形容词一般有good, nice, kind, wise, silly, stupid, foolish, right, wrong, careless, impolite等,如:It is very kind of you to help him every day.