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问题: How many English classes do you have in a week?

这里的do怎么理解?

解答:

do在这里是v.aux.(助动词)

Used with the infinitive without to in questions, negative statements, and inverted phrases:
用于疑问句、否定句和倒装句:跟不带to 的不定式连用,见于问句、否句、倒装句中:
Do you understand? 你懂吗?