was的過(guò)去式是什么？

was 為 is 和 am 的過(guò)去式，與 is am 用法一致，只不過(guò)需在過(guò)去時(shí)使用

was用于判襲 I ,he , she, it 以及 單者沖碼個(gè)人作主語(yǔ)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.
補(bǔ)充：
were 是are 過(guò)去式 。
were用于you, they, we 以及兩個(gè)以上的人作主語(yǔ)首哪的句子。
例如：
You were at home yesterday.
They were at the playground an hour ago.
We were singing in the room an hour ago.