Before I get home,you can help your sister do her homework.(

此句的意思是在我回家之前,你可以辅导你妹妹做功课.
所以我们可以用一个词语：辅导 ,指导,coach.Give us some guidance in,Tutored
同义句如下：
Before I get home,you can coach your sister about her homework.
Before I get home,you can give us some guidance in your sister’s homework.
Before I get home,you can tutor your sister’s homework.
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同义句 Before I get home,you can help your sister with her homework

you can help your sister do her homework when I got home

Before I get home,you can help your sister with her homework。