MODAL VERBS OF DEDUCTION

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Your mother _____ be a great cook. You are always so keen to get back home to eat!

MUST

I don't know why I am so tired these days. I ____ be working too hard. Or maybe I am not sleeping too well.

MIGHT

Do you know where Carl is? He ______ be out - his car keys are on the table.

CAN'T

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