CAN and HAVE
CAN (modal) + HAVE
Remember:
CAN is a modal verb (called « modal »). A modal is used before ordinary verbs.
CAN is used to express meanings such as Possibility, Ability, Permission,
Offers, Requests, Instructions, with Senses verbs, Deduction.
« CAN HAVE »: CAN + Infinitive without « to »
when you don’t know if something has happened,
– you ask for it (question sentence),
– you say that it hasn’t happened (negative sentence).
« can have » in questions sentences:
Can you have done it?
Can you have broken the car?
Can she have called me?
« can have » in negatives sentences:
He can’t have done it so quickly, that’s impossible!
They can’t have heard us.
REVIEW:
Can it have happened? (question?)
It can’t have happened! (negative!)
Here, « have » is the base form: infinitive without « to ».
CAN COULD and TO BE ABLE TO: