1.I help mother to do the housework frequently .
I help mother to do the housework not
frequently .
2.Wang Ping is studying English together with her schoolmate .
Wang Ping has not been studying English together with her schoolmate .
3.My father mother is sitting on the sofa talks.
My father mother has not been sitting on the sofa talks.
4.You knew how the school does walk .
You did not know how the school does walk.
5.Has how many kilometers Beijing to Baoding .
有些我不知道.我知道的都告诉你了