I could fair you could fair he could fair we could fair you could fair they could fair
V-ing form
I could be fairing you could be fairing he could be fairing we could be fairing you could be fairing they could be fairing
Perfect
I could have faired you could have faired he could have faired we could have faired you could have faired they could have faired
V-ing perfect
I could have been fairing you could have been fairing he could have been fairing we could have been fairing you could have been fairing they could have been fairing
Negation
Simple form
I could not fair you could not fair he could not fair we could not fair you could not fair they could not fair
V-ing form
I could not be fairing you could not be fairing he could not be fairing we could not be fairing you could not be fairing they could not be fairing
Perfect
I could not have faired you could not have faired he could not have faired we could not have faired you could not have faired they could not have faired
V-ing perfect
I could not have been fairing you could not have been fairing he could not have been fairing we could not have been fairing you could not have been fairing they could not have been fairing
Interrogative form
Simple form
could I fair? could you fair? could he fair? could we fair? could you fair? could they fair?
V-ing form
could I be fairing? could you be fairing? could he be fairing? could we be fairing? could you be fairing? could they be fairing?
Perfect
could I have faired? could you have faired? could he have faired? could we have faired? could you have faired? could they have faired?
V-ing perfect
could I have been fairing? could you have been fairing? could he have been fairing? could we have been fairing? could you have been fairing? could they have been fairing?
Interro-negative form
Simple form
could I not fair? could you not fair? could he not fair? could we not fair? could you not fair? could they not fair?
V-ing form
could I not be fairing? could you not be fairing? could he not be fairing? could we not be fairing? could you not be fairing? could they not be fairing?
Perfect
could I not have faired? could you not have faired? could he not have faired? could we not have faired? could you not have faired? could they not have faired?
V-ing perfect
could I not have been fairing? could you not have been fairing? could he not have been fairing? could we not have been fairing? could you not have been fairing? could they not have been fairing?