過去進(jìn)行時(shí)：

1.概念：表示過去某段時(shí)間或某一時(shí)刻正在發(fā)生或進(jìn)行的行為或動(dòng)作。

2.時(shí)間狀語(yǔ)：at this time yesterday, at that time或以when引導(dǎo)的謂語(yǔ)動(dòng)詞是一般過去時(shí)的時(shí)間狀語(yǔ)等。

3.基本結(jié)構(gòu)：was/were+doing

4.否定形式：was/were + not + doing.

5.一般疑問句：把was或were放于句首。

6.例句：At that time she was working in a PLA unit.

When he came in, I was reading a newspaper.

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