Sometime I am helping my mother with the housework.哪里错了

Sometime I am helping my mother with the housework.哪里错了 I am helping my mother（ ）housework．A do B doing C is doing I am helping my mother___the housework.A.in B.to C.with D.on I often help my mother with housework d_____ the weekend. I often help my mother with housework d------ the holiday I often help my mother _____ with the housework.A.with B.at I ---- my mother with the housework all the afternoon 填选 i often help my mother to do the housework 哪里有错? I often help my mother with the housework,and she usually he I must help my mother with the housework.(改为同义句) i often help my mother with the housework on sundays.为什么用wit help mother i the housework with my 怎样连词成句