We should do what we can （to help） them with their lessons.

题目

We should do what we can （to help） them with their lessons.
启动中学作业本上的,to help,为什么不是help,

答案

We should do what we can （to help） them with their lessons.=We should do what we can do（to help） them with their lessons.这略了动词do,这样就清楚了吧