I can compete you can compete he can compete we can compete you can compete they can compete
V-ing form
I can be competing you can be competing he can be competing we can be competing you can be competing they can be competing
Perfect
I can have competed you can have competed he 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 he can have been competing we can have been competing you can have been competing they can have been competing
Negation
Simple form
I can't compete you can't compete he can't compete we can't compete you can't compete they can't compete
V-ing form
I can't be competing you can't be competing he can't be competing we can't be competing you can't be competing they can't be competing
Perfect
I can't have competed you can't have competed he can't have competed we can't have competed you can't have competed they can't have competed
V-ing perfect
I can't have been competing you can't have been competing he can't have been competing we can't have been competing you can't have been competing they can't have been competing
Interrogative form
Simple form
can I compete? can you compete? can he compete? can we compete? can you compete? can they compete?
V-ing form
can I be competing? can you be competing? can he be competing? can we be competing? can you be competing? can they be competing?
Perfect
can I have competed? can you have competed? can he 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 he have been competing? can we have been competing? can you have been competing? can they have been competing?
Interro-negative form
Simple form
can't I compete? can't you compete? can't he compete? can't we compete? can't you compete? can't they compete?
V-ing form
can't I be competing? can't you be competing? can't he be competing? can't we be competing? can't you be competing? can't they be competing?
Perfect
can't I have competed? can't you have competed? can't he have competed? can't we have competed? can't you have competed? can't they have competed?
V-ing perfect
can't I have been competing? can't you have been competing? can't he have been competing? can't we have been competing? can't you have been competing? can't they have been competing?