作业帮怎么用法?
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怎么用法?
怎么用法?
怎么用法?
was 为 is 和 am 的过去式,与 is am 用法一致,只不过需在过去时使用
was用于 I ,he ,she,it 以及 单个人作主语的句子.
例如：
I was born in 1998.
He was a doctor three years ago.
She was at home yesterday.
It was Monday yesterday.
Mike wasn't at home this morning.
补充：
were 是are 过去式 .
were用于you,they,we 以及两个以上的人作主语的句子.
例如：
You were at home yesterday.
They were at the playground an hour ago.
We were singing in the room an hour ago.
是am is的过去式属于be动词 用法和is am一样 如i was 或 he was
was是，
用于过去式，用法和is、are相同