I can attend you can attend she can attend we can attend you can attend they can attend
V-ing form
I can be attending you can be attending she can be attending we can be attending you can be attending they can be attending
Perfect
I can have attended you can have attended she can have attended we can have attended you can have attended they can have attended
V-ing perfect
I can have been attending you can have been attending she can have been attending we can have been attending you can have been attending they can have been attending
Negation
Simple form
I can't attend you can't attend she can't attend we can't attend you can't attend they can't attend
V-ing form
I can't be attending you can't be attending she can't be attending we can't be attending you can't be attending they can't be attending
Perfect
I can't have attended you can't have attended she can't have attended we can't have attended you can't have attended they can't have attended
V-ing perfect
I can't have been attending you can't have been attending she can't have been attending we can't have been attending you can't have been attending they can't have been attending
Interrogative form
Simple form
can I attend? can you attend? can she attend? can we attend? can you attend? can they attend?
V-ing form
can I be attending? can you be attending? can she be attending? can we be attending? can you be attending? can they be attending?
Perfect
can I have attended? can you have attended? can she have attended? can we have attended? can you have attended? can they have attended?
V-ing perfect
can I have been attending? can you have been attending? can she have been attending? can we have been attending? can you have been attending? can they have been attending?
Interro-negative form
Simple form
can't I attend? can't you attend? can't she attend? can't we attend? can't you attend? can't they attend?
V-ing form
can't I be attending? can't you be attending? can't she be attending? can't we be attending? can't you be attending? can't they be attending?
Perfect
can't I have attended? can't you have attended? can't she have attended? can't we have attended? can't you have attended? can't they have attended?
V-ing perfect
can't I have been attending? can't you have been attending? can't she have been attending? can't we have been attending? can't you have been attending? can't they have been attending?