English verb conjugation
COULD FLAP

Regular verb: flap - flapped - flapped

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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