MODALS OF SPECULATION
Help
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/MAY
Do you know where Carl is? He __________ be out - his car keys are on the table.
CAN'T
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