一般有动词过去式,过去的时间点,the other dayhesaid ，“i met the boy at six ”转为He said that he had met the boy at six.怎么解释呢？？主句为过去式，从句相应过去式。从句原来就是过去式，那就用过去的过去，过去完成时，had done 结构