强调句和定语从句-When did you last see him?-Let me think.It was last year______I left for London at the airport.为什么用when 不用that..

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强调句和定语从句-When did you last see him?-Let me think.It was last year______I left for London at the airport.为什么用when 不用that..

强调句和定语从句-When did you last see him?-Let me think.It was last year______I left for London at the airport.为什么用when 不用that..
强调句和定语从句
-When did you last see him?
-Let me think.It was last year______I left for London at the airport.
为什么用when 不用that..

强调句和定语从句-When did you last see him?-Let me think.It was last year______I left for London at the airport.为什么用when 不用that..
如果用that,那么I left for ...就做year的定语,但很明显,I left for...不是用来修饰year的
所以用when,翻译为:那是去年当我在机场准备前往伦敦时
when 翻译为:当.时

when是副词,可以在定语从句中作状语;而that是代词,要在从句中作主语或宾语,但从句中的语法成分齐全,that无法充电成分,故that错误。

这是一个省略句,完整的句子为:
it was last year when l left for londdon at he airport that I last saw him.此句中when 引导的是定语从句,先行词为last year。it was----that 是个强调句型。
意思为:正是去年我前往伦敦在机场时,我最后一次看到的他。