when的时态总结
when引导时间状语从句：表示有规律的，都用一般现在时；表示将来的事情，用主将从现；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）。扩展资料
when引导的'从句用什么时态
如果是宾语从句，那么时态问题就参考宾语从句的做法
如果是时间状语从句，则基本有4种
1.表示有规律的，都用一般现在时
如：Water turns into steam when we heat it.
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）
如：I will tell him when he comes back.
3.表示过去两个有先后的动作，都用过去式
如：When he came back, I told him the news.
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）
如：I met my teacher when i was walking in the street.
这里我告诉你个记语法的秘密：背句子记语法
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