11. Drinking this water is not safe. à It’s not ________________________________________________________________________ . 12. Swimming across this river is dangerous. à It is___________________________________________________________________________ . 13. To do this exercise is not easy. à It’s ___________________________________________________________________________ . 14. It is difficult to open the window. à To open____________________________________________________________________ à The window _______________________________________________ 15. They are going to see a movie. à They will__________________________________ à They intend___________________________________ 16. I ought to go and visit Grandma after work. à I have______________________________________________ à I must_____________________________________________

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