be doing..when.. be about to do.. when . had done ..when.. should have done should not have done 这几个短语我没弄明白 大哥大姐们给我举几个简单的例句就行 谢谢咯
I was reading a book when it started to rain yesterday. 昨天开始下雨的时候，我正在读书 I was about to go shopping when the telephone rang. 当我正要去购物的时候电话响了 I had broken a cup when my mother came in. 我妈进来的时候我已经打碎了一个杯子（注意是过去完成时） I should have done some mopping before he came back 在他回来以前我应该拖下地 I should not cheated her when my mother asked the question. 我妈问我问题的时候我不应该撒谎
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