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

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Wehavefourclassesinthemorning.four划线变成howmanyclassesdoyouhaveinthemorning.中DO是为什么Wehavefourclassesin

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
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

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
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

Do是个助动词,并无实际意义,真正的动词是后面的have