I could unhair you could unhair he could unhair we could unhair you could unhair they could unhair
V-ing form
I could be unhairing you could be unhairing he could be unhairing we could be unhairing you could be unhairing they could be unhairing
Perfect
I could have unhaired you could have unhaired he could have unhaired we could have unhaired you could have unhaired they could have unhaired
V-ing perfect
I could have been unhairing you could have been unhairing he could have been unhairing we could have been unhairing you could have been unhairing they could have been unhairing
Negation
Simple form
I couldn't unhair you couldn't unhair he couldn't unhair we couldn't unhair you couldn't unhair they couldn't unhair
V-ing form
I couldn't be unhairing you couldn't be unhairing he couldn't be unhairing we couldn't be unhairing you couldn't be unhairing they couldn't be unhairing
Perfect
I couldn't have unhaired you couldn't have unhaired he couldn't have unhaired we couldn't have unhaired you couldn't have unhaired they couldn't have unhaired
V-ing perfect
I couldn't have been unhairing you couldn't have been unhairing he couldn't have been unhairing we couldn't have been unhairing you couldn't have been unhairing they couldn't have been unhairing
Interrogative form
Simple form
could I unhair? could you unhair? could he unhair? could we unhair? could you unhair? could they unhair?
V-ing form
could I be unhairing? could you be unhairing? could he be unhairing? could we be unhairing? could you be unhairing? could they be unhairing?
Perfect
could I have unhaired? could you have unhaired? could he have unhaired? could we have unhaired? could you have unhaired? could they have unhaired?
V-ing perfect
could I have been unhairing? could you have been unhairing? could he have been unhairing? could we have been unhairing? could you have been unhairing? could they have been unhairing?
Interro-negative form
Simple form
couldn't I unhair? couldn't you unhair? couldn't he unhair? couldn't we unhair? couldn't you unhair? couldn't they unhair?
V-ing form
couldn't I be unhairing? couldn't you be unhairing? couldn't he be unhairing? couldn't we be unhairing? couldn't you be unhairing? couldn't they be unhairing?
Perfect
couldn't I have unhaired? couldn't you have unhaired? couldn't he have unhaired? couldn't we have unhaired? couldn't you have unhaired? couldn't they have unhaired?
V-ing perfect
couldn't I have been unhairing? couldn't you have been unhairing? couldn't he have been unhairing? couldn't we have been unhairing? couldn't you have been unhairing? couldn't they have been unhairing?