when后面加什么时态
首先要看when引导的是什么从句，是宾语从句还是时间状语从句。如果是宾语从句，时态就参考宾语从句的做法。
如果是时间状语从句，有四种情况：表示有规律的，用一般现在时；表示将来的事情，主将从现；表示过去两个有先后的动作，都用过去式；表示一个动作正在进行（过去进行时），另一个动作插入（过去式）。
when引导时间状语从句
1.表示有规律的，都用一般现在时。
Water turns into steam when we heat it.
当我们把水加热时，它就变成了水蒸汽。
2.表示将来的事情，用主将从现（主句将来时，从句一般现在时）。
I will tell him when he comes back.
他回来时我会告诉他的。
3.表示过去两个有先后的动作，都用过去式。
When he came back,I told him the news.
他回来时，我把消息告诉了他。
4.表示一个动作正在进行（过去进行时），另一个动作插入（过去式）。
I met my teacher when i was walking in the street.
我在街上走的时候遇到了我的老师。
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