I could cater you could cater he could cater we could cater you could cater they could cater
V-ing form
I could be catering you could be catering he could be catering we could be catering you could be catering they could be catering
Perfect
I could have catered you could have catered he could have catered we could have catered you could have catered they could have catered
V-ing perfect
I could have been catering you could have been catering he could have been catering we could have been catering you could have been catering they could have been catering
Negation
Simple form
I could not cater you could not cater he could not cater we could not cater you could not cater they could not cater
V-ing form
I could not be catering you could not be catering he could not be catering we could not be catering you could not be catering they could not be catering
Perfect
I could not have catered you could not have catered he could not have catered we could not have catered you could not have catered they could not have catered
V-ing perfect
I could not have been catering you could not have been catering he could not have been catering we could not have been catering you could not have been catering they could not have been catering
Interrogative form
Simple form
could I cater? could you cater? could he cater? could we cater? could you cater? could they cater?
V-ing form
could I be catering? could you be catering? could he be catering? could we be catering? could you be catering? could they be catering?
Perfect
could I have catered? could you have catered? could he have catered? could we have catered? could you have catered? could they have catered?
V-ing perfect
could I have been catering? could you have been catering? could he have been catering? could we have been catering? could you have been catering? could they have been catering?
Interro-negative form
Simple form
could I not cater? could you not cater? could he not cater? could we not cater? could you not cater? could they not cater?
V-ing form
could I not be catering? could you not be catering? could he not be catering? could we not be catering? could you not be catering? could they not be catering?
Perfect
could I not have catered? could you not have catered? could he not have catered? could we not have catered? could you not have catered? could they not have catered?
V-ing perfect
could I not have been catering? could you not have been catering? could he not have been catering? could we not have been catering? could you not have been catering? could they not have been catering?