過去進(jìn)行時表示的是在過去某一時刻或某一段時間內(nèi)進(jìn)行或發(fā)生的動作，這個動作是延續(xù)性的。所以，非延續(xù)性動詞和表感覺，感情，情緒，精神活動，所屬關(guān)系等的動詞，一般都不用于過去進(jìn)行時態(tài)，常見的這類動詞不能用于過去進(jìn)行時的主要有：agree， be， believe， belong， care， forget， hate， have（擁有）， hear， know， like， love， mean， mind， notice， own， remember， seem， suppose， understand， want， wish等。例如：

誤：He is denying that he has seen the wallet.
正：He denies that he has seen the wallet.他否認(rèn)他曾經(jīng)見過這個錢包。
誤：I was knowing the answer.
正：I knew the answer. 我知道答案。
誤：I wasn't understanding him.
正：I didn't understand him. 我不明白他的意思。
誤：i was reading when she was coming.
正：i was reading when she came in.她進(jìn)來的時候，我正在讀書。
誤：While we were talking, the teacher was coming.
正：While we were talking, the teacher came in. 當(dāng)我們正在說話的時候，老師進(jìn)來了。
誤：When someone was knocking at the door, we were having supper.
正：When someone knocked at the door, we were having supper.
有人敲門時，我們正在吃晚飯。

典型例題：
1） Mary ___ a dress when she cut her finger.
　　A. made　B. is making　C. was making　D. makes
答案C. 割傷手指是已發(fā)生的事情，應(yīng)用過去時。同時，when表時間的同時性，“瑪麗在做衣服時”提供事情發(fā)生的背景，因此用過去進(jìn)行時。
2） As she ___ the newspaper，Granny ___ asleep.
　　A. read；was falling B. was reading；fell C. was reading；was falling D. Read；fell
答案B.句中的as = when， while，意為"當(dāng)……之時"。描述一件事發(fā)生的背景時，用過去進(jìn)行；一個長動作發(fā)生的時候，另一個短動作發(fā)生。句意為 "在她看報紙時，奶奶睡著了。"句中的 fell （fall的過去時），是系動詞，后跟形容詞，如：fall sick。
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