when引导从句主句与从句之间的时态有什么规律可循吗?

如题所述

第1个回答  2019-09-18
when 引导从句时 ,作“当.时候”时,主从句的时态保持一致;作“这时候,正在这时”讲时主从句有三种时态表示:
He was about to leave when someone called me .
We were swimming in the lake when it rained.
The little boy had finished the homework when his mother had him learn the piano.
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