English verb conjugation
CAN FLAP

Regular verb: flap - flapped - flapped

Affirmation

Simple form	V-ing form
I can flap you can flap he can flap we can flap you can flap they can flap	I can be flapping you can be flapping he can be flapping we can be flapping you can be flapping they can be flapping
Perfect	V-ing perfect
I can have flapped you can have flapped he can have flapped we can have flapped you can have flapped they can have flapped	I can have been flapping you can have been flapping he can have been flapping we can have been flapping you can have been flapping they can have been flapping

Negation

Simple form	V-ing form
I can't flap you can't flap he can't flap we can't flap you can't flap they can't flap	I can't be flapping you can't be flapping he can't be flapping we can't be flapping you can't be flapping they can't be flapping
Perfect	V-ing perfect
I can't have flapped you can't have flapped he can't have flapped we can't have flapped you can't have flapped they can't have flapped	I can't have been flapping you can't have been flapping he can't have been flapping we can't have been flapping you can't have been flapping they can't have been flapping

Interrogative form

Simple form	V-ing form
can I flap? can you flap? can he flap? can we flap? can you flap? can they flap?	can I be flapping? can you be flapping? can he be flapping? can we be flapping? can you be flapping? can they be flapping?
Perfect	V-ing perfect
can I have flapped? can you have flapped? can he have flapped? can we have flapped? can you have flapped? can they have flapped?	can I have been flapping? can you have been flapping? can he have been flapping? can we have been flapping? can you have been flapping? can they have been flapping?

Interro-negative form

Simple form	V-ing form
can't I flap? can't you flap? can't he flap? can't we flap? can't you flap? can't they flap?	can't I be flapping? can't you be flapping? can't he be flapping? can't we be flapping? can't you be flapping? can't they be flapping?
Perfect	V-ing perfect
can't I have flapped? can't you have flapped? can't he have flapped? can't we have flapped? can't you have flapped? can't they have flapped?	can't I have been flapping? can't you have been flapping? can't he have been flapping? can't we have been flapping? can't you have been flapping? can't they have been flapping?