Modals of Speculation and Deduction

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They ... be away for a weekend but I'm not sure.

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Luckily, tomorrow ... be a sunny day.

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The exam ... be easy. You never know.

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She has been studying for exams 4 hours a day. Definitely, she ... pass them well.

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He ... be French, he speaks this language badly.

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Henry ... be at home. I phoned him a few minutes ago and he was watching TV.

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Nobody is answering. They ... be at home.

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I'm sure Fiona doesn't have a dog. So it ... be Fiona's dog.

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Jim is on the holidays. He ... be somewhere lying in the beach, but I can't say for sure.

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It's impossible! They ... phone me so early!

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He ... be from the USA/. He doesn't speak English at all!

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It ... be the right answer but we have to check it.