I can cramp you can cramp he can cramp we can cramp you can cramp they can cramp
V-ing form
I can be cramping you can be cramping he can be cramping we can be cramping you can be cramping they can be cramping
Perfect
I can have cramped you can have cramped he can have cramped we can have cramped you can have cramped they can have cramped
V-ing perfect
I can have been cramping you can have been cramping he can have been cramping we can have been cramping you can have been cramping they can have been cramping
Negation
Simple form
I cannot cramp you cannot cramp he cannot cramp we cannot cramp you cannot cramp they cannot cramp
V-ing form
I cannot be cramping you cannot be cramping he cannot be cramping we cannot be cramping you cannot be cramping they cannot be cramping
Perfect
I cannot have cramped you cannot have cramped he cannot have cramped we cannot have cramped you cannot have cramped they cannot have cramped
V-ing perfect
I cannot have been cramping you cannot have been cramping he cannot have been cramping we cannot have been cramping you cannot have been cramping they cannot have been cramping
Interrogative form
Simple form
can I cramp? can you cramp? can he cramp? can we cramp? can you cramp? can they cramp?
V-ing form
can I be cramping? can you be cramping? can he be cramping? can we be cramping? can you be cramping? can they be cramping?
Perfect
can I have cramped? can you have cramped? can he have cramped? can we have cramped? can you have cramped? can they have cramped?
V-ing perfect
can I have been cramping? can you have been cramping? can he have been cramping? can we have been cramping? can you have been cramping? can they have been cramping?
Interro-negative form
Simple form
can I not cramp? can you not cramp? can he not cramp? can we not cramp? can you not cramp? can they not cramp?
V-ing form
can I not be cramping? can you not be cramping? can he not be cramping? can we not be cramping? can you not be cramping? can they not be cramping?
Perfect
can I not have cramped? can you not have cramped? can he not have cramped? can we not have cramped? can you not have cramped? can they not have cramped?
V-ing perfect
can I not have been cramping? can you not have been cramping? can he not have been cramping? can we not have been cramping? can you not have been cramping? can they not have been cramping?