为什么where were you last night 句子里用的是were ?

为什么where were you last night 句子里用的是were ?

you 不是单数吗
可以用was 吗 where was you last night.这样
请说明一下为什么
因为you是不能跟is,根is的是第一人称,you要跟are,卜旅are跟第二人称,而型耐凳时间状亩升语是last night,are的过去式是were
you是第二人称“你”,第二人配码桥称与be动词连用培猛时都用be动词模碰的复数形式。
eg.You are a beautiful girl.
Were you happy last night?
you和be动词连用时be动词都只用复数形式。
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