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Read the grumpy resident cat's strict list of house rules for the new puppy. Select ALL the sentences that correctly use modal verbs to express ability or deny permission.
The correct answers are You can't sleep on the good sofa; it is exclusively mine. and When I was younger, I could catch three toy mice at once.
"Can't" (or cannot) is perfect for denying permission in the present, and "could" is used here to show a proud past ability. The incorrect options use the wrong verb forms after the modals: we never use an "-ing" word or a "to" infinitive immediately after "can," "could," "cannot," or "couldn't."