How long have you known the other students in this class?, How long have you known your oldest friend?, How long have you known the teacher?, How long have you lived in this town?, How long have you lived in your house or flat?, How long have you had the shoes you are wearing?, How long have you had your watch?, How long have you studied English?, How long have you had your mobile phone?, How long have you been married/single?.

The Present Perfect Tense

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