过去进行式和过去式a kind man called the police when he saw the accident后面 when he saw the accident 是一个动作Mary was having dinner when i saw herwhen i saw her 也是个动作 为什么前者用过去式 后者用进行市?什么时候用过去进行市?
问题描述：
过去进行式和过去式
a kind man called the police when he saw the accident
后面 when he saw the accident 是一个动作
Mary was having dinner when i saw her
when i saw her 也是个动作
为什么前者用过去式 后者用进行市?
什么时候用过去进行市?
答