English verb conjugation
COULD FLAIL

Regular verb: flail - flailed - flailed

Affirmation

Simple form	V-ing form
I could flail you could flail she could flail we could flail you could flail they could flail	I could be flailing you could be flailing she could be flailing we could be flailing you could be flailing they could be flailing
Perfect	V-ing perfect
I could have flailed you could have flailed she could have flailed we could have flailed you could have flailed they could have flailed	I could have been flailing you could have been flailing she could have been flailing we could have been flailing you could have been flailing they could have been flailing

Negation

Simple form	V-ing form
I could not flail you could not flail she could not flail we could not flail you could not flail they could not flail	I could not be flailing you could not be flailing she could not be flailing we could not be flailing you could not be flailing they could not be flailing
Perfect	V-ing perfect
I could not have flailed you could not have flailed she could not have flailed we could not have flailed you could not have flailed they could not have flailed	I could not have been flailing you could not have been flailing she could not have been flailing we could not have been flailing you could not have been flailing they could not have been flailing

Interrogative form

Simple form	V-ing form
could I flail? could you flail? could she flail? could we flail? could you flail? could they flail?	could I be flailing? could you be flailing? could she be flailing? could we be flailing? could you be flailing? could they be flailing?
Perfect	V-ing perfect
could I have flailed? could you have flailed? could she have flailed? could we have flailed? could you have flailed? could they have flailed?	could I have been flailing? could you have been flailing? could she have been flailing? could we have been flailing? could you have been flailing? could they have been flailing?

Interro-negative form

Simple form	V-ing form
could I not flail? could you not flail? could she not flail? could we not flail? could you not flail? could they not flail?	could I not be flailing? could you not be flailing? could she not be flailing? could we not be flailing? could you not be flailing? could they not be flailing?
Perfect	V-ing perfect
could I not have flailed? could you not have flailed? could she not have flailed? could we not have flailed? could you not have flailed? could they not have flailed?	could I not have been flailing? could you not have been flailing? could she not have been flailing? could we not have been flailing? could you not have been flailing? could they not have been flailing?