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 can't befool you can't befool he can't befool we can't befool you can't befool they can't befool
V-ing form
I can't be befooling you can't be befooling he can't be befooling we can't be befooling you can't be befooling they can't be befooling
Perfect
I can't have befooled you can't have befooled he can't have befooled we can't have befooled you can't have befooled they can't have befooled
V-ing perfect
I can't have been befooling you can't have been befooling he can't have been befooling we can't have been befooling you can't have been befooling they can't 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't I befool? can't you befool? can't he befool? can't we befool? can't you befool? can't they befool?
V-ing form
can't I be befooling? can't you be befooling? can't he be befooling? can't we be befooling? can't you be befooling? can't they be befooling?
Perfect
can't I have befooled? can't you have befooled? can't he have befooled? can't we have befooled? can't you have befooled? can't they have befooled?
V-ing perfect
can't I have been befooling? can't you have been befooling? can't he have been befooling? can't we have been befooling? can't you have been befooling? can't they have been befooling?