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 could not unhair you could not unhair he could not unhair we could not unhair you could not unhair they could not unhair
V-ing form
I could not be unhairing you could not be unhairing he could not be unhairing we could not be unhairing you could not be unhairing they could not be unhairing
Perfect
I could not have unhaired you could not have unhaired he could not have unhaired we could not have unhaired you could not have unhaired they could not have unhaired
V-ing perfect
I could not have been unhairing you could not have been unhairing he could not have been unhairing we could not have been unhairing you could not have been unhairing they could not 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
could I not unhair? could you not unhair? could he not unhair? could we not unhair? could you not unhair? could they not unhair?
V-ing form
could I not be unhairing? could you not be unhairing? could he not be unhairing? could we not be unhairing? could you not be unhairing? could they not be unhairing?
Perfect
could I not have unhaired? could you not have unhaired? could he not have unhaired? could we not have unhaired? could you not have unhaired? could they not have unhaired?
V-ing perfect
could I not have been unhairing? could you not have been unhairing? could he not have been unhairing? could we not have been unhairing? could you not have been unhairing? could they not have been unhairing?