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)行的動作

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

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