一、情态动词的被动结构由“情态动词＋be＋ED分词”构成
Ground plans and contour(等高线) maps of the Earth _____ from aerial photographs.
［A］ can be drawn
［B］ can draw
［C］ to draw
［D］ drawn
When ［A］ a spinning ball bounces， some of ［B］ the energy contained in its rotation can transferr ［C］ to its energy of forward motion ［D］ .
Orchestral instruments _____ under the following types：strings，woodwind， brass， and percussion(打击乐器组).
［A］ grouped
［B］ can group
［C］ can be grouped
［D］ to be grouped
二、成语动词的被动语态
这里的成语动词包括“动词＋介词”，“动词＋副词”和“动词＋副词＋介词”
After a heated ［A］ discussion for ［B］ a long time that afternoon, a suggestion putted forward ［C］ by ［D］ the head of the committee.
It was quite obvious that ［A］ those problems were never paid ［B］ attention ［C］ by ［D］ designers.
三、主动语态与被动语态的混淆
Highly precise ［A］ measurements have been shown ［B］ that variation in ［C］ the Earth’s rotation is largely controlled by climatic conditions ［D］ .
Great changes _____ in the city, since the reform and opening to the outside world, and a lot of factories .
［A］ have been taken place, have been set up
［B］ have taken place, have been set up
［C］ have taken place, have set up
［D］ were taken place, were set up
Ｍild forms of exercise can _____ some of the loss of flexibility that accompanies aging.
［A］ stop
［B］ to stop
［C］ stopping
［D］ be stopped
四、例题解析
A为正确答案。
C错。本题含有情态动词，由于主语(energy)与谓语动词(can transfer)之间存在着被动关系，所以，本句C处应改为“can be transferred”。
C对。判断主被动语态，关键要看主语能否发出谓语动词的动作。本句的主语“乐器”显然不能自己“分组”，而是被分为…。故用被动态。
C错。改为was putted forward。
C错。改为attention to。pay attention to是一固定词组，不能丢失小品词to。
B错。改为“have shown”。原句主句选用了现在完成时的被动语态，而主语“测量结果”分明能自己显示“show”，故应用主动语态才对。全句译为：“高度精确的测量结果显示地球转动的变化主要受气候条件的控制。”
B对。take place是不及物动语短语，它的主语为事或物，故用主动语态，因为有since 介词短语，所以这里用完成时，不用过去时。后半句主语factories 与谓语set up之间的关系是被动关系，故用被动语态，B 为正确答案。
A对。和上例相同，主语“锻炼”本身也能起到“stop…flexibility”的作用，故应选主动语态。
