I can befool you can befool he can befool we can befool you can befool they can befool
V-ing form
I can be befooling you can be befooling he can be befooling we can be befooling you can be befooling they can be befooling
Perfect
I can have befooled you can have befooled he can have befooled we can have befooled you can have befooled they can have befooled
V-ing perfect
I can have been befooling you can have been befooling he can have been befooling we can have been befooling you can have been befooling they can have been befooling
Negation
Simple form
I cannot befool you cannot befool he cannot befool we cannot befool you cannot befool they cannot befool
V-ing form
I cannot be befooling you cannot be befooling he cannot be befooling we cannot be befooling you cannot be befooling they cannot be befooling
Perfect
I cannot have befooled you cannot have befooled he cannot have befooled we cannot have befooled you cannot have befooled they cannot have befooled
V-ing perfect
I cannot have been befooling you cannot have been befooling he cannot have been befooling we cannot have been befooling you cannot have been befooling they cannot have been befooling
Interrogative form
Simple form
can I befool? can you befool? can he befool? can we befool? can you befool? can they befool?
V-ing form
can I be befooling? can you be befooling? can he be befooling? can we be befooling? can you be befooling? can they be befooling?
Perfect
can I have befooled? can you have befooled? can he have befooled? can we have befooled? can you have befooled? can they have befooled?
V-ing perfect
can I have been befooling? can you have been befooling? can he have been befooling? can we have been befooling? can you have been befooling? can they have been befooling?
Interro-negative form
Simple form
can I not befool? can you not befool? can he not befool? can we not befool? can you not befool? can they not befool?
V-ing form
can I not be befooling? can you not be befooling? can he not be befooling? can we not be befooling? can you not be befooling? can they not be befooling?
Perfect
can I not have befooled? can you not have befooled? can he not have befooled? can we not have befooled? can you not have befooled? can they not have befooled?
V-ing perfect
can I not have been befooling? can you not have been befooling? can he not have been befooling? can we not have been befooling? can you not have been befooling? can they not have been befooling?