(15) It was because he got there late that we didn't catch the first bus.
(16) Was it not until he finished his homework that he went to bed? (17)When was it that he went to bed? 1.it 作形式主语
当不定式、动名词短语或从句作主语时,为平衡句子,通常用it 作形式主语,而将真正的主语移到句子的末尾,如:(1)。
用于某些固定句型中: ①It looks / sounds as if从句,句意为“看起来好像……;听起来好像……”,如:(2)。 ② It happens that从句,句意为“碰巧……”,如:(3)。 ③ It appears / seems that从句,句意为“看来…”,如:(4)。 ④ How did it come about that从句,句意为“……怎么发生的?”,如:(5)。 ⑤ It is no good/use doing sth. 句型,句意为:“……没有用。” ⑥ It doesn't matter/ makes no difference + 特殊疑问词/whether / if 从句。 ⑦ It turned out that从句,意为“结果是……,证明是……”。 ⑧ It occurred to / hit sb.that从句,意为“某人突然想到了……”。 ⑨ It is no/little wonder that从句,意为“难怪……”。 2.it 作形式宾语
当不定式、动名词短语或从句作宾语时,有些情况须用it 作形式宾语。 ① think / consider / find / feel / make / believe / regard + it + adj./n. (for sb.) + to do,如:(6)。 ② think / consider / find / feel +it+ no good / use doing sth.,如:(7)。 ③ believe / imagine / think / consider / find / feel / (make) / regard / +it+ adj. / n. + that从句,如:(8)。 ④ hate / dislike / love / like +it + when从句,如:(9)。 ⑤ appreciate + it+ if从句,如:(10)。 ⑥ see to/ answer for it+ that从句;depend on it +that从句,如:(11)。 3.it引导强调句型
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