Use either the present perfect simple or continuous in the following sentences. 1. i (to try) to open this box for the last forty minutes but in vain. 2. it (to snow): the garden is covered with snow. 3. who (to break) the window? 4. have you (to smoke)! i can smell tobacco on your clothes. 5. it's the best book i ( ever to read). 6. i (to listen) to you for the past half an hour, but i can't understand what you are speaking about. 7. how long has your aunt (to be ill)? 8. the school (to be closed) for two months. 9. hey! somebody (to drink) my coffee! my cup was full. 10. i don't think i (ever to see) her looking so upset before.