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Become the office gossip for a moment! Select ALL the sentences that use modals of deduction correctly.
"Look at Bob wearing a full tuxedo to the office on a Tuesday! ..."
The correct answers are He must be going to a special event later. and He could be attending a wedding this afternoon.
Must is used for strong positive deductions, and could is used for possibilities. Both are perfectly correct here!
"He can be a secret agent" is incorrect because can is not used to guess about specific present situations.
"He must to have" is incorrect because modal verbs are always followed by a bare infinitive (without "to").