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