I will do the cooking for lunch.为什么用cooking?Do you have a bike one Yes,I have a new one?

问题描述:

I will do the cooking for lunch.为什么用cooking?Do you have a bike one Yes,I have a new one?
第二题为什么用one?

do the cooking是固定词组,像do some reading也是,one同类不同物.而it是指同类且同物.one=a+名词不懂,能不能说说句中用one 和ones的区别?one是单数可数名词,ones是指复数名词啊