I can cater you can cater she can cater we can cater you can cater they can cater
V-ing form
I can be catering you can be catering she can be catering we can be catering you can be catering they can be catering
Perfect
I can have catered you can have catered she 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 she 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 she cannot cater we cannot cater you cannot cater they cannot cater
V-ing form
I cannot be catering you cannot be catering she cannot be catering we cannot be catering you cannot be catering they cannot be catering
Perfect
I cannot have catered you cannot have catered she 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 she 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 she cater? can we cater? can you cater? can they cater?
V-ing form
can I be catering? can you be catering? can she be catering? can we be catering? can you be catering? can they be catering?
Perfect
can I have catered? can you have catered? can she 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 she 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 she 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 she 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 she 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 she not have been catering? can we not have been catering? can you not have been catering? can they not have been catering?