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

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.