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 couldn't flail you couldn't flail she couldn't flail we couldn't flail you couldn't flail they couldn't flail	I couldn't be flailing you couldn't be flailing she couldn't be flailing we couldn't be flailing you couldn't be flailing they couldn't be flailing
Perfect	V-ing perfect
I couldn't have flailed you couldn't have flailed she couldn't have flailed we couldn't have flailed you couldn't have flailed they couldn't have flailed	I couldn't have been flailing you couldn't have been flailing she couldn't have been flailing we couldn't have been flailing you couldn't have been flailing they couldn't 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
couldn't I flail? couldn't you flail? couldn't she flail? couldn't we flail? couldn't you flail? couldn't they flail?	couldn't I be flailing? couldn't you be flailing? couldn't she be flailing? couldn't we be flailing? couldn't you be flailing? couldn't they be flailing?
Perfect	V-ing perfect
couldn't I have flailed? couldn't you have flailed? couldn't she have flailed? couldn't we have flailed? couldn't you have flailed? couldn't they have flailed?	couldn't I have been flailing? couldn't you have been flailing? couldn't she have been flailing? couldn't we have been flailing? couldn't you have been flailing? couldn't they have been flailing?