it is...that...与it is...when...

It was 8 oclock when he came back.

It was last night that he came back.

这两个句子都是正确的。

问题一,第二个句子可以用when吗?

问题二,it在两句中的用法。

如题
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1 个回答

It was 8 o'clock when he came back.?本句中的 it 为虚义用法,指时间,其后的 when 引导时间状语从句。句意是:当他回来时,时间是8点钟。?It was last night that he came back.?本句为 it was ... that... 型的强调句式,相当于:He came back last night.句中的 it 没有任何意义,它只是用于引出强调句,其中的 that 也不可改为 when,否则意思不通。
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