do some后面加什么形式

　　I usually do some shopping on weekends。

　　I'm doing some cleaning。

　　I'm going to do some shopping。

　　Every night，I retreat to my lonely bedsit，and sit and do some life doing。

　　每天晚上，我都退隱到我的小房間里面，坐著隨便做點什么事。

　　We should help our mothers do some housework like washing the dishes, doing the laundry and cooking on a daily basis.

　　我們應該每天都幫媽媽做一些家務，比如洗碗，洗衣和做飯。