(1)当不定式的动作正在进行时,不定式要用进行式;当不定式的动作在谓语动作之前发生时,不定式要用完成式;当不定式的逻辑主语为不定式动作的承受者时,不定式要用被动式。
(2)当现在分词的动作早于谓语动作之前发生时,现在分词要用完成式;当现在分词的逻辑主语为其动作的承受者时,现在分词要用被动式。
(3)现在分词的完成被动式和过去分词都表示被动和完成,两种形式作状语时常可互换,但作定语时只能用过去分词形式,不能用现在分词的完成被动式。
1.Many things such as going abroad and owning a car,______ impossible in the past,are now very common.
A.being considered B.to be considered
C.considering
D.considered
2.______to the second hand smoke for long,I think,will damage your body.
A.Exposed
B.Exposing
C.Being exposed
D.After being exposed
3.(2012·北京东城统一测练)Many of the students who hope to enter the university will be disappointed because only one third ______ for admission will be accepted.
A.apply
B.to apply
C.applied
D.applying
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