She ____ be Dave's sister. She looks A LOT like him. That ____ be John's calculator...I'm not sure. The Loch Ness monster ____ exist. It's impossible. This ____ be the right answer - I'm certain. She speaks with a British accent, so she ____ be from England. He ____ be fourteen. He has a beard! That information ____ be correct but I'm going to check on the Internet to confirm. The expert says the climate ____ get warmer. I think it is possible He ____ be from Austria. He doesn't speak German. She's been working on the book 14 hours a day for a month. She ____ be exhausted. We ____ go to Ibiza this summer, but it's not certain.

Must, might, can't (modals of deduction)

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