一般过去时和过去完成时的区别

一般过去时仅仅表示过去发生的动作或状态。如：She played basketball yesterday。She was a teacher ten years ago。过去完成时侧重表示一个动作在过去某个动作之前已经发生完成了,侧重于”过去的过去“是一个相对时态。如：When i got to the station,the bus had already left。