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
英语人气:205 ℃时间:2019-08-21 02:52:43
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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
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