i was born 为什么用was不是were

英语句型:When were you born?和 I was born in 1997.
为什么问句要用“were”而答句要用“was”呢
我知道这里是被动语态,可是“you”和“I”不都是用应该用“were”么?

“I” 要与be动词中的am,was连用
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