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
答
Do是个助动词,并无实际意义,真正的动词是后面的have
答
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