一、状语从句的省略 1.省略状语从句中的主语和be动词,只保留分词或不定式,
此种情况适用于从句和主句的主语一致时。
He opened his mouth as if(he were) to say something.
他张开嘴好像有话要说。 2.省略状语从句中的主语及系动词,保留从属连词及表语,
此种情况适用于从句的主语是it时。
I will come to help you if (it is) necessary.
必要时我会来帮助你的。 3.在虚拟条件句中,如含有had,were,should等助动词,if
可以省略,句子使用倒装。
Were I twenty now,I would join the army.
如果我现在20岁,我就参军。 二、动词不定式的省略
当不定式中含有前面已经出现的动词时,整个不定
式可以省略,但在以下情况下要保留不定式符号to
来代替整个不定式短语。 1.在want,tell,expect,mean,hope,love,plan,ask
等动词后作宾语或宾语补足语时。
I asked him to have dinner together,but he didn't want
to.我请他一起去吃饭,但他不想去。 2.在have,need,be going to,be able to,ought to,used
to等情态动词或半助动词构成的复合结构中。
I didn't want to leave without him,but I had to.
我不想丢下他走,但我不得不这样。 3.在eager,anxious,careful,afraid,pleased,glad,
happy, sorry等形容词后。
—Would you like to come to our party?
你愿意来参加我们的聚会吗?
—I'd be glad to.我很乐意去。 4.在teach,know,wonder,ask,decide等动词后接“疑
问词+不定式”作宾语时。
I would give him some advice,but I don't know what to.
我想给他一些建议,但我不知道给些什么建议。 [注意] (1)否定形式的省略用not to。 —Shall I go instead of him?我替他去好吗? —I prefer not to.我看还是别吧。 (2)如果在省略的不定式结构中含有:be,have,have been,这些词要保留。 —He hasn't finished yet.他还没有完成。 —Well,he ought to have.哦,他应该已经完成了。 三、替代性省略 1.so可以替代句子,经常和believe,think,suppose,
hope 等词连用。 2.not可以用来替代一个否定结构的从句或谓语,常用于
hope,believe,think,suppose等动词之后。
—Will it rain today?今天会下雨吗?
—I hope not.(I hope it won't rain today.)我希望不下。 3.助动词do可以用来替代前面已经出现的谓语动词,以
避免语言上的重复。
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