26. When did you first meet him?
-> How long have...
27. When did they buy the house.
-> How long have...
28. When did you star listening to classical music?
-> How long have...
29. When did they start building this bridge?
-> How long haven't...
30. How long ago did you last see Mary?
-> How long haven't...
31. How long ago did he break his leg?
-> How long has...
32. How long have they painted the house?
-> How long have...
33. How long has she learnt French?
-> How long has...
34. How long is it since he painted the door?
-> How long ago did...
35. How long is it since Jack met Rose?
-> How long have...
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