Bonjour

EXO 3

a- The hikers have been walking in the snow for two hours.

b- My sister's friends have worked here since  2011.

c- How long did you talk to that famous actress last Saturday ?

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EXO 4

a- John has been learning English for three years.

b- We have been bird watching for three hours.

c- I have been skiing for one hour.

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EXO 5

a- How long ago did they settle in the country ?

b- Who has bought this house since 1st May 2014 ?

c- How long have they been living in London now ?

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EXO 6

a- I have been learning English for five years.

b- My elder sister began learning Italian four years ago.

c- We have been waiting holidays for weeks now.

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bonne soirée ☺☺☺