I can march you can march she can march we can march you can march they can march
V-ing form
I can be marching you can be marching she can be marching we can be marching you can be marching they can be marching
Perfect
I can have marched you can have marched she can have marched we can have marched you can have marched they can have marched
V-ing perfect
I can have been marching you can have been marching she can have been marching we can have been marching you can have been marching they can have been marching
Negation
Simple form
I cannot march you cannot march she cannot march we cannot march you cannot march they cannot march
V-ing form
I cannot be marching you cannot be marching she cannot be marching we cannot be marching you cannot be marching they cannot be marching
Perfect
I cannot have marched you cannot have marched she cannot have marched we cannot have marched you cannot have marched they cannot have marched
V-ing perfect
I cannot have been marching you cannot have been marching she cannot have been marching we cannot have been marching you cannot have been marching they cannot have been marching
Interrogative form
Simple form
can I march? can you march? can she march? can we march? can you march? can they march?
V-ing form
can I be marching? can you be marching? can she be marching? can we be marching? can you be marching? can they be marching?
Perfect
can I have marched? can you have marched? can she have marched? can we have marched? can you have marched? can they have marched?
V-ing perfect
can I have been marching? can you have been marching? can she have been marching? can we have been marching? can you have been marching? can they have been marching?
Interro-negative form
Simple form
can I not march? can you not march? can she not march? can we not march? can you not march? can they not march?
V-ing form
can I not be marching? can you not be marching? can she not be marching? can we not be marching? can you not be marching? can they not be marching?
Perfect
can I not have marched? can you not have marched? can she not have marched? can we not have marched? can you not have marched? can they not have marched?
V-ing perfect
can I not have been marching? can you not have been marching? can she not have been marching? can we not have been marching? can you not have been marching? can they not have been marching?