1.  Mary realized that they were making fun of her.

被动句:

1a. Mary realized that she was being made fun of. （正）

1b. Mary realized that fun was being made of her.  (正)

【例句】Much fun was made of unreliable Japanese watches and cheap Japanese cars.

不可靠的日本手表、汽车闹出很多笑话。

2.  You must lay special emphasis on the choice of words.

被动句：

2a. Special emphasis must be laid on the choice of words. （正）

2b. The choice of words must be laid special emphasis on. (正)

【例句】As to the content, both teaching and research should be laid emphasis on while the former should be regarded as the fundamental factor.

在评价内容方面，应教学、科研并重，突出教学的根本性。

3.  They lost track of the plane about an hour out from Guangzhou Airport.

被动句：

3a. The plane was lost track of about an hour out from Guangzhou Airport. （误）

3b. Track was lost of the plane about an hour out from Guangzhou Airport. （误）

4.  We must put an end to this state of things as soon as possible.

被动句：

4a. This state of things must be put end to as soon as possible. （正）

4b. An end must be put to this state as soon as possible. （误）

请教老师，1b，2b，3b， 4b即原句第二个被动句是否正确？有些多词动词有两种被动句，如，take care of, pay attention to, make an example of, take advantage of; 但是像以上4个例句中， 貌似只有第一个被动句是正确的。请教老师，如何知道这些多词动词的被动句到底是两个还是只是其中一个？谢谢老师。

【答】动词 + 名词 + 介词”型，这样的短语大多都能变为被动形式，如：

如：take care of（关心，照顾），make use of（利用）, pay attention to（注意）等。

有时可把“动词+名词+介词”短语动词中的名词变成被动语态的主语。

    Time must be made good use of.一定要充分利用时间。

    More attention should be paid to our environment.应该多注意我们的环境。