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test-english.com › grammar-points › contentsB1 Modal verbs of deduction – must, might, could, can’t. B1+ Past modal verbs of deduction. B1+ likely, unlikely, bound, definitely, probably – probability. B2 Speculation and deduction – modal verbs and expressions. A2 used to, didn’t use to – past habits and states. B1 usually, used to, be used to, get used to.