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Réponse:

exo1

3) for 20 year

4)20 year ago

5)an hour ago

6)a few days ago

7)for six months

8)for a long time

exo2

2)Jack has been here since Tuesday

3) it's been raining for an hour

4) I've known sue since 2002

5) Claire and Matthew have been married six months ago

6) Liz has started studying medicine at university for 3 years.

7)David has started playing piano since he is 7 years old