主语从句与先行it
主语从句可以按其引导词的不同分为三类:
第一类,用从属连词that引导的主语从句,例如:
That we shall be late is certain.
That the driver could not control his car was obvious.
这种结构主要是对that从句的内容进行强调,属正式文体,连词that不可以省略;但是在一般情况下,往往使用先行it结构,即用it作形式主语,而把that从句放到后面,这时,在口语中,连词that有时则可以省略。所以上述两句可以改为:
It is certain that we shall be late.
It was obvious that the driver could not control his car.
如果整个句子是疑问形式,就只能用先行it结构,例如:
Is it true that he would take the risk?
Is it possible that they will come tomorrow?
常使用先行it结构,用that从句作主语的句子有下列几个句型:
1、It + be + 形容词 + that从句:
It is clear that he was telling the truth.
Its probable that well be a little late.
2、It + be + 名词词组 + that从句:
Its a pity that you cant go with us.
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