Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could step step you could step step she could step step we could step step you could step step they could step step
V-ing form
I could be step steping you could be step steping she could be step steping we could be step steping you could be step steping they could be step steping
Perfect
I could have step steped you could have step steped she could have step steped we could have step steped you could have step steped they could have step steped
V-ing perfect
I could have been step steping you could have been step steping she could have been step steping we could have been step steping you could have been step steping they could have been step steping
Negation
Simple form
I could not step step you could not step step she could not step step we could not step step you could not step step they could not step step
V-ing form
I could not be step steping you could not be step steping she could not be step steping we could not be step steping you could not be step steping they could not be step steping
Perfect
I could not have step steped you could not have step steped she could not have step steped we could not have step steped you could not have step steped they could not have step steped
V-ing perfect
I could not have been step steping you could not have been step steping she could not have been step steping we could not have been step steping you could not have been step steping they could not have been step steping
Interrogative form
Simple form
could I step step? could you step step? could she step step? could we step step? could you step step? could they step step?
V-ing form
could I be step steping? could you be step steping? could she be step steping? could we be step steping? could you be step steping? could they be step steping?
Perfect
could I have step steped? could you have step steped? could she have step steped? could we have step steped? could you have step steped? could they have step steped?
V-ing perfect
could I have been step steping? could you have been step steping? could she have been step steping? could we have been step steping? could you have been step steping? could they have been step steping?
Interro-negative form
Simple form
could I not step step? could you not step step? could she not step step? could we not step step? could you not step step? could they not step step?
V-ing form
could I not be step steping? could you not be step steping? could she not be step steping? could we not be step steping? could you not be step steping? could they not be step steping?
Perfect
could I not have step steped? could you not have step steped? could she not have step steped? could we not have step steped? could you not have step steped? could they not have step steped?
V-ing perfect
could I not have been step steping? could you not have been step steping? could she not have been step steping? could we not have been step steping? could you not have been step steping? could they not have been step steping?