Modals: Certainty and necessity

Hi guys,

Some notes on the usage of must/can't for certainty, as we have been reviewing recently.

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 Int - EGC - must cant - certainty.pdf

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Advanced: difference between "can't" and "must not"

And a brief review of this other usage, mustn't/don't have to for necessity:

 Int - EGC - must not - do not have to.pdf

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Enjoy