過去進(jìn)行時(shí)的用法詳解

　　(1)    表示在過去某一時(shí)間正在進(jìn)行的動(dòng)作，此時(shí)句中往往有表示過去的時(shí)間狀語then,at that time,this time,yesterday等。

　　I was doing my homework when my mother came to home.

　　(2)敘述在過去的同一時(shí)間都在進(jìn)行的幾個(gè)動(dòng)作，通常用While

　　I was studying at college while my brother was teaching at university..

　　(3)表示在過去某一段時(shí)間內(nèi)一直持續(xù)進(jìn)行的動(dòng)作

　　They were expecting you yesterday, but you didn't turn up.
 

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