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