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來源：中考網(wǎng) 作者：紫涵 2013-02-05 14:32:19
過去進行時的用法詳解
(1) 表示在過去某一時間正在進行的動作，此時句中往往有表示過去的時間狀語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間都在進行的幾個動作，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間內(nèi)一直持續(xù)進行的動作
They were expecting you yesterday, but you didn't turn up.
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