We have four classes in the morning.four划线变成how many classes do you have in the morning.中DO是为什么

问题描述:

We have four classes in the morning.four划线变成how many classes do you have in the morning.中DO是为什么

Do是个助动词,并无实际意义,真正的动词是后面的have

How many classes do you have in the morning?
do是助动词,疑问句要用助动词+动词原形