When I did my homework,my father came back.

这个句子对吗？

前面的did，，，一定要改成was doing吗？

When I lived in the countryside,I worked for a newspaper.这样可以吗？

when 的主从句时态，有什么规律吗？老师可以给我讲一下吗？

When I did my homework, my father came back. 这句话语义不清。至少有三种改法：

When I was doing my homework, my father came back.

When I had done my homework, my father came back.

When I was about/going to do my homework, my father came back.

刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编

擅长：语法理论,语言学,文化背景 | 采纳率 86% | 回答于 1秒前

默认排序时间排序

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黎反修 - 英语翻译（已退休） 1秒前

擅长：数词用法,存在句,英语考试

when引导时间状语从句的例句：

When he saw me , he waved. 他一看到我就向我挥手。（摘自《麦克米伦高阶英汉双解词典》）