have been 与had been

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have been 与had been
在遇到什么局子时have been 改用had been

have been变成had been的情况一般出现在宾语从句中.因为宾语从句的时态要与主句谓语动词时态一致.比如：
He has been in China for 4 years.这是has been.但变成宾语从句的时候,如果主句是过去式,这里也要变成had been.例子：
Tom said he had been in China for 4 years.汤姆说他在中国呆了4年了.由于主句的谓语said是过去式,所以has been变成了had been.

have been 与had been have/had + been/be? have been talking, had been told? have been 和had been 什么区别 will,will be,had been,have been 句子中的has been ,have been,had been 代表什么? have been / has been / had been 的区别 had been warned与have warned有什么区别 have been married与had married有什么区别 have written,have been writting,have been written,had writte have been to与have been in have been in与 have been to