Question

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-How long do they know the doctor?
-For five years
 There is not cheese in this fridge
 These children has bought Book Two last Saturday
 How long are they going to stay in these city?

Answer 1

-How long have they known the doctor?
-For five years
 There is no cheese in this fridge
 These children have bought Book Two last Saturday
 How long are they going to stay in this city?