1, How long have you met her?
2, How long have you bought this house?
3, How long has Nam written to you?
4, How long have you worked here?
5, How long have you studied English?
6, When were you here?
7, How long has he absented from school?
8, How long has he left HCM City?
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*Cấu trúc: `How long + have/has + S + Ved/PII…?`
