why don't you go fishing with your father?(同义句) why ____ ____ fishing with your father?

问题描述:

why don't you go fishing with your father?(同义句) why ____ ____ fishing with your father?
还有一个就是
i don't know how i use comma(同义)
i don't know ____ ____ comma.

why not go fishing with your father?
i don't know how to use comma.