Question

So we should do what we can to protect out environment这句话中what we can做什么成分？

Answer 1

So we should do what we can to protect out environment这句话中what we can做为宾语从句，what为引导宾语从句

Answer 2

在这里是做do的宾语补足语，因为这里是做do的补充说明，do为宾语。

Answer 3

what we can
为宾语从句，what为引导宾语从句

Answer 4

t in an endless vista. So we go about our petty tasks,

Answer 5

这是一个固定搭配 do what one can do sth