my mind wasn't on what he was saying.为什么不能用had said,时态一致是什么意

你好. 语法对的,但意思不一样.
1 My mind was on what he had said ------当时我在想他以前说的话.
2 My mind was on what he was saying-----当时我在想他正在说的话.

时态一致指的是,比如说：
1 He is a doctor and has worked in this hospital for 10 years.(is和has都是指现在,时态是一致的)
2 He is a doctor and had worked in this hospital for 10 years.( 在这里,is与had就不一致了.)如果要保持时态的一致,就必须是：He is a doctor and has worked in this hospital for 10 years. 或者是He was a doctor and had worked in this hospital for 10 years.(

had said 这是过去完成时，过去完成时表示过去的过去，也就是事情发生在过去的某个动作之前。如果这里用had said，那么说明有一个动作要先于这个say发生，但这句话动词就2个，还有一个是be动词，那么你就要去考虑这2个动词，是否是say这个动词先发生，然后才my mind wasn't on···，从意思上来看，应该是同时发生，那么从句中用过去完成时就不对。...