It.............since I got up., has rained, has been raining, Have they ....... the experiment yet?, finished, been finishing, Have you ever........a tropical storm?, seen, been seeing, We........to find a solution to the problem for weeks., have tried, have been trying, Good news! Sam.......a solution to the problem!, has found, has been finding, Sorry, I am late. How long have you.....?, waited, been waiting, Scientists ..... to find a solution to climate change for decades., have tried, have been trying, It hasn't......for ages., snowed, been snowing

present perfect, present perfect continuous

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