a general question with the present indefinite tense
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1.be动词:
陈述句 I am a student.
变为疑问句 Are you a student?
2.其他动词:
陈述句 He spends 30 yuan to but the book..
变为疑问句 Does he spend 30 yuan to buy the book?
如果主语是第一人称 I 就用“do"