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1 Does it often snow in winter? 2 I don't know the boy. I have never met him. 3 I have been cleaning my room for two hours. 4 She has been cooking lunch for an hour. 5 Those girls translated Part Two last Monday. 6 Natasha can't go. She hasn't finished her work yet. 7 They discussed everything two days ago. 8 He is not swimming. He is jumping now. 9 I think that he will be late tomorrow. 10 I have been learning the new words since ten o'clock.

1 Does it often snow in winter? 2 I don't know the boy. I have never met him. 3 I have been cleaning my room for two hours.  4 She has been cooking lunch for an hour.  5 Those girls translated Part Two last Monday.  6 Natasha can't go. She hasn't finished her work yet. 7 They discussed everything two days ago. 8 He is not swimming. He is jumping now. 9 I think that he will be late tomorrow.  10 I have been learning the new words since ten o'clock.