i think parents should first help their kids (这里为什么没有to)know study iswhat they should be(为什么有be)doing?

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ithinkparentsshouldfirsthelptheirkids(这里为什么没有to)knowstudyiswhattheyshouldbe(为什么有be)doing?ithinkparen

i think parents should first help their kids (这里为什么没有to)know study iswhat they should be(为什么有be)doing?
i think parents should first help their kids (这里为什么没有to)know study is
what they should be(为什么有be)doing?

i think parents should first help their kids (这里为什么没有to)know study iswhat they should be(为什么有be)doing?
那个to可以省略.should是情态动词后面要跟动词原形,be是are的原形,所以要用be.而且 be doing表示现在进行时,这里用的就是这个语法.

help后面可以不跟to