Rewrite these sentences

. Rewrite these sentences:

1 How long ago did he start dancing?
  How long has ..............
2 The birds began building this net last week.
   The birds have...............
4. How long have you studied in this university?
   How long  ago.......
5 We began to live independently when we were 18 years old.
 We have.........
6 She has become sick since the children left home.
 She started........
7 I started doing my business four years ago.
 I have...........
8 They have known each other for 12 years.
   They started......
9 The last time he talked to her was two weeks ago.
    He has.........
10. This is the most beautiful house I ' ve ever seen.
 I have..........
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