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 can't step you can't step she can't step we can't step you can't step they can't step
V-ing form
I can't be stepping you can't be stepping she can't be stepping we can't be stepping you can't be stepping they can't be stepping
Perfect
I can't have stepped you can't have stepped she can't have stepped we can't have stepped you can't have stepped they can't have stepped
V-ing perfect
I can't have been stepping you can't have been stepping she can't have been stepping we can't have been stepping you can't have been stepping they can't 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't I step? can't you step? can't she step? can't we step? can't you step? can't they step?
V-ing form
can't I be stepping? can't you be stepping? can't she be stepping? can't we be stepping? can't you be stepping? can't they be stepping?
Perfect
can't I have stepped? can't you have stepped? can't she have stepped? can't we have stepped? can't you have stepped? can't they have stepped?
V-ing perfect
can't I have been stepping? can't you have been stepping? can't she have been stepping? can't we have been stepping? can't you have been stepping? can't they have been stepping?