9. David has been painting/has painted in his studio since 10 o’clock. 10. Mary and Sam have collected/ have been collecting stamps for 3 years.

11. Their parents have been/have being friends since their childhood.

12. Dave has been/ has been being a student for 2 years.
Present Perfect

маша9393 маша9393    1   27.11.2020 09:22    9

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levkamorkovka levkamorkovka  27.12.2020 09:22

9. David has been painting in his studio since 10 o’clock.

10. Mary and Sam have been collecting stamps for 3 years.

11. Their parents have been friends since their childhood.

12.Dave has been a student for 2 years.

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