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Modal verbs of probability are used to express an opinion of the speaker based on information that the speaker has. Example: He must be at work, it's 10 o'clock. In this case, the speaker is 100 % sure that the person is at work based on the speaker's knowledge that the person in question usually works at during the day.

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March 16, 2008 at 5:44 pm
(1) anastasia says:

he is not 100%. he is 99% sure.

100% is “he *is*.

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