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改主动语态为被动语态:

People are still cutting down too many trees in the USA.

答案:
解析:

  答案:Too many trees are still being cut down in the USA.

  解析:显然这句话要改为现在进行时的被动语态。cut down是词组不能分开或缺少。现在进行时的被动语态的构成形式为:be+being+pp. 其中前面的be为am, is, are, was, were.

  拓展延伸:根据以上例题的讲解,为方便同学们记忆,我们把各种时态的被动语态编为一个口诀如下:

  pp前面各种be; am, is, are现在时;was和were表过去;将来,情态不变be;完成have(has)been;进行时态两个be,前表时态后加-ing.


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