we were deeply impressed by what the little boy had done请讲一下这道题的语法?by

we were deeply impressed by what the little boy had done请讲一下这道题的语法?by
we were deeply impressed by what the little boy had done请讲一下这道题的语法?by

we were deeply impressed by what the little boy had done请讲一下这道题的语法?by
impress sb = 给他人留下深刻的印
impressed by sb = （被他人）留下深刻的印象,即他人给我留下很深刻的印象
what the little boy had done = 那个小孩所做的事
we were deeply impressed by what the little boy had done
句子是说
那个小孩儿的所作所为给我留下了非常深刻的印象
希望帮到了你,若满意请点击“选为满意答案”及时采纳,谢谢.

by 介词 表示 被 的意思

by后面的what引导的从句作为宾语
可以记住be impressed by 被....所感动