Present Perfect/Perfect Continuous. 1.I...(to try) to open this box for the last forty minutes. 2.It...(to snow) : the

1. I have been trying to open this box for the last forty minutes. 2. It has been snowing: the garden is covered with snow. 3. Who has broken the window? 4. Have you smoked? I can smell tobacco on your clothes. 5. It\'s the best book I have ever read. 6. I have been listening to you for the past half an hour, but I can\'t understand what you are speaking about. 7. How long has your aunt been ill? 8. The school has been closed for two months. 9. Hey! Somebody has drunk my coffee! My cup was full. 10. I don\'t think I have ever seen her looking so upset before. 11. I have been sitting here in the park for an hour, and I have met three friends of mine. 12. How much money have you saved for the holidays?