I could bail you could bail she could bail we could bail you could bail they could bail
V-ing form
I could be bailing you could be bailing she could be bailing we could be bailing you could be bailing they could be bailing
Perfect
I could have bailed you could have bailed she could have bailed we could have bailed you could have bailed they could have bailed
V-ing perfect
I could have been bailing you could have been bailing she could have been bailing we could have been bailing you could have been bailing they could have been bailing
Negation
Simple form
I couldn't bail you couldn't bail she couldn't bail we couldn't bail you couldn't bail they couldn't bail
V-ing form
I couldn't be bailing you couldn't be bailing she couldn't be bailing we couldn't be bailing you couldn't be bailing they couldn't be bailing
Perfect
I couldn't have bailed you couldn't have bailed she couldn't have bailed we couldn't have bailed you couldn't have bailed they couldn't have bailed
V-ing perfect
I couldn't have been bailing you couldn't have been bailing she couldn't have been bailing we couldn't have been bailing you couldn't have been bailing they couldn't have been bailing
Interrogative form
Simple form
could I bail? could you bail? could she bail? could we bail? could you bail? could they bail?
V-ing form
could I be bailing? could you be bailing? could she be bailing? could we be bailing? could you be bailing? could they be bailing?
Perfect
could I have bailed? could you have bailed? could she have bailed? could we have bailed? could you have bailed? could they have bailed?
V-ing perfect
could I have been bailing? could you have been bailing? could she have been bailing? could we have been bailing? could you have been bailing? could they have been bailing?
Interro-negative form
Simple form
couldn't I bail? couldn't you bail? couldn't she bail? couldn't we bail? couldn't you bail? couldn't they bail?
V-ing form
couldn't I be bailing? couldn't you be bailing? couldn't she be bailing? couldn't we be bailing? couldn't you be bailing? couldn't they be bailing?
Perfect
couldn't I have bailed? couldn't you have bailed? couldn't she have bailed? couldn't we have bailed? couldn't you have bailed? couldn't they have bailed?
V-ing perfect
couldn't I have been bailing? couldn't you have been bailing? couldn't she have been bailing? couldn't we have been bailing? couldn't you have been bailing? couldn't they have been bailing?