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