问:He is a student
否定:He isn't a student;
疑问匀句.Is he a student?
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如果本题有什么不明白可以追问,在问两题:we are watching tv now。she goes to school every doy都是否定和疑问句。谢谢了we are watching tv nowwe aren't watching tv now，Are they wacthing tv now？she goes to school every day.she doesn't go to school every day.Does she go to school every day?