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li lei asked jim when ( leave )for beijing

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li lei asked jim when ( leave )for beijing
li lei asked jim when ( leave )for beijing
Li Lei asked Jim when leaving for beijing.李雷问吉姆什么时候去北京.(when在这里是介词)
再问: 句式里,哪些when才是介词
再答:   when 后接句子是连词,接词或短语是介词。  这句子也可说:   li lei asked Jim when  he would leave for Beijing
再问: 连词,接词是什么还是介词。
再答: 也就是说,when 后面跟句子是连词,不跟句子是介词。