为什么he said,'did you see him last night变为he asked me whether i had seen him the night before

题目

为什么he said,'did you see him last night变为he asked me whether i had seen him the night before
为什么改成 whether i had seen ,had是怎么改的?seen是怎么改的

答案

根据规则,直接引语中用did一般过去时,变为间接引语,用过去完成时,had done,
所以有了had,see的过去分词就是seen.
请及时采纳,多谢!