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 couldn't fair you couldn't fair he couldn't fair we couldn't fair you couldn't fair they couldn't fair
V-ing form
I couldn't be fairing you couldn't be fairing he couldn't be fairing we couldn't be fairing you couldn't be fairing they couldn't be fairing
Perfect
I couldn't have faired you couldn't have faired he couldn't have faired we couldn't have faired you couldn't have faired they couldn't have faired
V-ing perfect
I couldn't have been fairing you couldn't have been fairing he couldn't have been fairing we couldn't have been fairing you couldn't have been fairing they couldn't 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
couldn't I fair? couldn't you fair? couldn't he fair? couldn't we fair? couldn't you fair? couldn't they fair?
V-ing form
couldn't I be fairing? couldn't you be fairing? couldn't he be fairing? couldn't we be fairing? couldn't you be fairing? couldn't they be fairing?
Perfect
couldn't I have faired? couldn't you have faired? couldn't he have faired? couldn't we have faired? couldn't you have faired? couldn't they have faired?
V-ing perfect
couldn't I have been fairing? couldn't you have been fairing? couldn't he have been fairing? couldn't we have been fairing? couldn't you have been fairing? couldn't they have been fairing?