说明︰此句型意为主词不是。was，were 是 be 动词的过去式，当句中出现以下副词词组)时，动词常用过去式：ago，before，yesterday(morning，afternoon，evening)， last night，the other day，in the past，just now。 在 was，were 后面加 not，即构成 be 动词过去式的否定句将 was，were 移到句首，w 改为大写，句点改为问号，即构成 be 动词过去式的疑问句.

Tom was not busy yesterday. 汤姆昨天不忙。

We were not at home yesterday. 我们昨天不在家。

It was not hot yesterday afternoon. 昨天下午天气不热。

The boys were sick yesterday. 这些男孩昨天生病。

It was cold last winter. 去年冬天天气寒冷。

Was your brother early to class yesterday morning? 你弟弟昨天早晨上课早到吗?

I didnt + V

结构︰主词+didnt+原形动词+过去时间。

说明︰本句型的肯定形式是：主词+过去式(+ed)+过去时间将肯定句中的过去式改为did not(=didnt)+原形动词，即构成过去式的否定句.

He didnt clean the room yesterday. 他昨天没打扫房间。

She washed the skirt yesterday. 她昨天洗这裙子。

Tom didnt watch TV last night. 汤姆昨晚没看电视。

He talked to his sister after lunch. 午餐后，他跟他的妹妹谈话。

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