was 怎么用 意思：是（am/is 的过去式 ）；
主语人称：第一人称和第三人称单数；
时态：一般过去时、过去进行时；
linestart
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.
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were 怎么用
意思：是（are 的过去式）；
主语人称：第二人称和其他人称复数；
时态：一般过去时、过去进行时；
linestart
You were at home yesterday.
They were at the playground an hour ago.
We were singing in the room an hour ago.
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否定式
was not = wasn't
were not = weren't
