第三人称单数过去式的用法例一:mom went to the shoing mall .例二:mom was happy .mom was came bake为什么例一不用加was而例二要加was?

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第三人称单数过去式的用法例一:mom went to the shoing mall .例二:mom was happy .mom was came bake为什么例一不用加was而例二要加was?
第三人称单数过去式的用法
例一:mom went to the shoing mall .例二:mom was happy .mom was came bake
为什么例一不用加was而例二要加was?

第三人称单数过去式的用法例一:mom went to the shoing mall .例二:mom was happy .mom was came bake为什么例一不用加was而例二要加was?
went 是go的过去式形式,在例一中是一种动作,所以要用实意动词go的相关形式.was 是be的过去式形式,表示一种状态