I could cater you could cater she could cater we could cater you could cater they could cater
V-ing form
I could be catering you could be catering she could be catering we could be catering you could be catering they could be catering
Perfect
I could have catered you could have catered she 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 she could have been catering we could have been catering you could have been catering they could have been catering
Negation
Simple form
I couldn't cater you couldn't cater she couldn't cater we couldn't cater you couldn't cater they couldn't cater
V-ing form
I couldn't be catering you couldn't be catering she couldn't be catering we couldn't be catering you couldn't be catering they couldn't be catering
Perfect
I couldn't have catered you couldn't have catered she couldn't have catered we couldn't have catered you couldn't have catered they couldn't have catered
V-ing perfect
I couldn't have been catering you couldn't have been catering she couldn't have been catering we couldn't have been catering you couldn't have been catering they couldn't have been catering
Interrogative form
Simple form
could I cater? could you cater? could she cater? could we cater? could you cater? could they cater?
V-ing form
could I be catering? could you be catering? could she be catering? could we be catering? could you be catering? could they be catering?
Perfect
could I have catered? could you have catered? could she 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 she have been catering? could we have been catering? could you have been catering? could they have been catering?
Interro-negative form
Simple form
couldn't I cater? couldn't you cater? couldn't she cater? couldn't we cater? couldn't you cater? couldn't they cater?
V-ing form
couldn't I be catering? couldn't you be catering? couldn't she be catering? couldn't we be catering? couldn't you be catering? couldn't they be catering?
Perfect
couldn't I have catered? couldn't you have catered? couldn't she have catered? couldn't we have catered? couldn't you have catered? couldn't they have catered?
V-ing perfect
couldn't I have been catering? couldn't you have been catering? couldn't she have been catering? couldn't we have been catering? couldn't you have been catering? couldn't they have been catering?