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How long....?

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  • How long / work at this school?
    How long have you been working / have you worked at this school?
  • How long / live in this city?
    How long have you been living/ have you lived in this city?
  • how long / be a teacher?
    How long have you been a teacher?
  • How long / know your best friend?
    How long have you known your best friend?
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