I can step you can step she can step we can step you can step they can step
V-ing form
I can be stepping you can be stepping she can be stepping we can be stepping you can be stepping they can be stepping
Perfect
I can have stepped you can have stepped she can have stepped we can have stepped you can have stepped they can have stepped
V-ing perfect
I can have been stepping you can have been stepping she can have been stepping we can have been stepping you can have been stepping they can have been stepping
Negation
Simple form
I cannot step you cannot step she cannot step we cannot step you cannot step they cannot step
V-ing form
I cannot be stepping you cannot be stepping she cannot be stepping we cannot be stepping you cannot be stepping they cannot be stepping
Perfect
I cannot have stepped you cannot have stepped she cannot have stepped we cannot have stepped you cannot have stepped they cannot have stepped
V-ing perfect
I cannot have been stepping you cannot have been stepping she cannot have been stepping we cannot have been stepping you cannot have been stepping they cannot have been stepping
Interrogative form
Simple form
can I step? can you step? can she step? can we step? can you step? can they step?
V-ing form
can I be stepping? can you be stepping? can she be stepping? can we be stepping? can you be stepping? can they be stepping?
Perfect
can I have stepped? can you have stepped? can she have stepped? can we have stepped? can you have stepped? can they have stepped?
V-ing perfect
can I have been stepping? can you have been stepping? can she have been stepping? can we have been stepping? can you have been stepping? can they have been stepping?
Interro-negative form
Simple form
can I not step? can you not step? can she not step? can we not step? can you not step? can they not step?
V-ing form
can I not be stepping? can you not be stepping? can she not be stepping? can we not be stepping? can you not be stepping? can they not be stepping?
Perfect
can I not have stepped? can you not have stepped? can she not have stepped? can we not have stepped? can you not have stepped? can they not have stepped?
V-ing perfect
can I not have been stepping? can you not have been stepping? can she not have been stepping? can we not have been stepping? can you not have been stepping? can they not have been stepping?