I helped my mum clean the rooms.为什么help用过去式clean却不用呢?

I helped my mum do some h（） I helped my mum clean the rooms.为什么help用过去式clean却不用呢? I Love My Mum I helped my classmate today. I went to play football ()I helped mum do some housework= I() ()to play football()I helped mum do somehousework【上面不够位了:-)】【急!】 The following discussion(讨论) took place(发生)　 between a father and his nine-year-old son．　　“It's unfair(不公平),Dad．Mum wants me to make my bed, but I don't know how．”　　“It's time for you to learn．Where are your clea I helped my friend bill with his (I helped my friend bill with his (C ) I like honey.My mum makes it. I think my mum is ____work now. my mum my dad and 后面接me还是i I love my mum 这里的my mum可以直接看作宾语吗 Mum came back home when i ___(do) my homework. I'm helping my mum m___ a shopping list now i usually go shop/shopping with my mum? because i go white my mum and Dad~ I always heip my mum clean the with a_______ I love you baby mum mum mum~ 选择句子,完成对话Tim:Mum, I helped lots of people today.Mum:( 1)Tim:Yes. First I helped Kate to find her discman in the schoolMum:Where did you find it?Tim:(2)Mum:And then?Tim:On the way home , Itook a man's arm and we crossed the street.Mum: