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,

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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,

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,
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,

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,
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

help
can后面接原形动词

答案是 to help,不定式作目的状语,修饰动词DO

用不定式to help表示一种目的

其实整句是we should do what we can do to help them with their lessons. we can do 是插入语,补充what的内容,其实就是we should do something to help them