过去完成时用在什么句型或者什么时态中？什么时候用现在完成时，什么时候用过去完成时？

Question

先说明一下上面的，在看一下下面的问题~

比如① I___(learn)English since three years ago. 是填have learned 还是had learned?

②By the time I____(get) there ,the bus ____(leave)
③When I found him,he _____(die) 这小题填had been dead 还是had died 还是什么？

Answer 1

过去完成时是某一动作从过去的某一时刻（比如是前天）持续到过去另一时刻（比如是昨天）结束的，或者是过去的过去已经发生；现在完成时是某一动作从过去的某一时刻一直持续到现在。
①have learned ②got；had left（我到达那里是过去发生的事情，车离开是我到达之前发生的，所以是过去的过去）③ had been dead和had died都可以，因为dead是形容词，用had been dead的意思是从他死了到我发现，他一直处于死的状态；die是动词，用had died的意思是我发现他是过去的某一时刻，而他死是过去的过去的某一时刻发生的事情

Answer 2

过去完成顾名思义在过去的过去，句子中要有明显的过去时间点，这样才能表达出更以前。before,by,when,,,i had finished my work before it rained.  i had been away when you arrived trhere.

一般过去式就是明显的时间状语，ago，when i was young, when i was in university客观的陈述过去发生的事 i was born in 1988.  i met her three years ago.

learned

got  had been away

had been dead  记住规定就行 die 是非延续性动词 要变为状态性的形容词或者副词

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