I can compete you can compete she can compete we can compete you can compete they can compete
V-ing form
I can be competing you can be competing she can be competing we can be competing you can be competing they can be competing
Perfect
I can have competed you can have competed she can have competed we can have competed you can have competed they can have competed
V-ing perfect
I can have been competing you can have been competing she can have been competing we can have been competing you can have been competing they can have been competing
Negation
Simple form
I cannot compete you cannot compete she cannot compete we cannot compete you cannot compete they cannot compete
V-ing form
I cannot be competing you cannot be competing she cannot be competing we cannot be competing you cannot be competing they cannot be competing
Perfect
I cannot have competed you cannot have competed she cannot have competed we cannot have competed you cannot have competed they cannot have competed
V-ing perfect
I cannot have been competing you cannot have been competing she cannot have been competing we cannot have been competing you cannot have been competing they cannot have been competing
Interrogative form
Simple form
can I compete? can you compete? can she compete? can we compete? can you compete? can they compete?
V-ing form
can I be competing? can you be competing? can she be competing? can we be competing? can you be competing? can they be competing?
Perfect
can I have competed? can you have competed? can she have competed? can we have competed? can you have competed? can they have competed?
V-ing perfect
can I have been competing? can you have been competing? can she have been competing? can we have been competing? can you have been competing? can they have been competing?
Interro-negative form
Simple form
can I not compete? can you not compete? can she not compete? can we not compete? can you not compete? can they not compete?
V-ing form
can I not be competing? can you not be competing? can she not be competing? can we not be competing? can you not be competing? can they not be competing?
Perfect
can I not have competed? can you not have competed? can she not have competed? can we not have competed? can you not have competed? can they not have competed?
V-ing perfect
can I not have been competing? can you not have been competing? can she not have been competing? can we not have been competing? can you not have been competing? can they not have been competing?