状语从句的省略
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状语从句的省略
一、五种状语从句常简化:
① if, unless条件状语从句;
② when, while, as, before, after, until / till时间状语从句;
③ although, though, even if / though让步状语从句;
④ as, as if方式状语从句;
⑤ as, than比较状语从句。
二、状语从句省略的两个条件:
①主句和从句的主语一致,或从句主语为it;
②
从句谓语动词含有be的某种形式。
e.g.
条件:He’ll go to the seaside fo r his holiday if (it is) possible.
时间:When (the museum is) completed, the museum will be open to the public next year.
比较:I’m taller than he (is tall ).
The higher the temperature (is), the greater the pressure (is ).
三、状语从句省略后的形式
1)从句主语为it的从句:
条件:If (it is) possible, he will help you out of the difficulty.
让步:You must attend the meeting unless (it is) inconvenient to you. 2)主句和从句的主语一致
a.连词+形容词
As (he was) young, he learned how to ride a bike.
Whenever (she is) free, she often goes shopping.
Work hard when (you are) young, or you'll regret.
b.连词+名词
While (he was) a young boy, he was always ready to help others. Although (he was) a farmer, now he is a famous director.
c.连词+现在分词
As (she was) walking along the river bank, she was singing a pop song. Although (he is) doing his best in maths these days, he has still got no good marks.
d.连词+过去分词
He won't go there with us unless (he is) invited.
The concert was a great success than (it was) expected.
e.连词+不定式
He stood up as if (he were) to say something.
He wouldn't solve the problem even if (he were) to take charge.
f. 连词+介词短语
She looked anxious as though (she was) in trouble.
He had mastered the English language before (he was) in the USA.
注意:当从句主语和主句主语不一致时,从句部分要么用完整的句子,要么用独立主格结构来表达。例如:
When the meeting was over, all the people went out of the meeting-room. =The meeting over, ……