题目内容：

please ask him to buy me a novel when he (通过)the bookshop tomorrow

优质解答

please ask him to buy me a novel when he (passes 通过)the bookshop tomorrow
注意；从句的一般将来时要用一般现在时代替.
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追问：

这里的when 是不是相当于if？那这题怎么写 i want to know when he (arrive at )the airport this morning

追答：

前一句是时间状语，但后一句是宾语从句。 i want to know when he (arrived at )the airport this morning