could stair-step
Verbe régulier : stair-step - stair-steped- stair-steped

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could stair-step
you could stair-step
she could stair-step
we could stair-step
you could stair-step
they could stair-step 	I could be stair-steping
you could be stair-steping
she could be stair-steping
we could be stair-steping
you could be stair-steping
they could be stair-steping	I could have stair-steped
you could have stair-steped
she could have stair-steped
we could have stair-steped
you could have stair-steped
they could have stair-steped	I could have been stair-steping
you could have been stair-steping
she could have been stair-steping
we could have been stair-steping
you could have been stair-steping
they could have been stair-steping	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not stair-step
you could not stair-step
she could not stair-step
we could not stair-step
you could not stair-step
they could not stair-step 	I could not be stair-steping
you could not be stair-steping
she could not be stair-steping
we could not be stair-steping
you could not be stair-steping
they could not be stair-steping	I could not have stair-steped
you could not have stair-steped
she could not have stair-steped
we could not have stair-steped
you could not have stair-steped
they could not have stair-steped	I could not have been stair-steping
you could not have been stair-steping
she could not have been stair-steping
we could not have been stair-steping
you could not have been stair-steping
they could not have been stair-steping	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I stair-step?
could you stair-step?
could she stair-step?
could we stair-step?
could you stair-step?
could they stair-step? 	could I be stair-steping?
could you be stair-steping?
could she be stair-steping?
could we be stair-steping?
could you be stair-steping?
could they be stair-steping? 	could I have stair-steped?
could you have stair-steped?
could she have stair-steped?
could we have stair-steped?
could you have stair-steped?
could they have stair-steped? 	could I have been stair-steping?
could you have been stair-steping?
could she have been stair-steping?
could we have been stair-steping?
could you have been stair-steping?
could they have been stair-steping? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not stair-step?
could you not stair-step?
could she not stair-step?
could we not stair-step?
could you not stair-step?
could they not stair-step? 	could I not be stair-steping?
could you not be stair-steping?
could she not be stair-steping?
could we not be stair-steping?
could you not be stair-steping?
could they not be stair-steping? 	could I not have stair-steped?
could you not have stair-steped?
could she not have stair-steped?
could we not have stair-steped?
could you not have stair-steped?
could they not have stair-steped? 	could I not have been stair-steping?
could you not have been stair-steping?
could she not have been stair-steping?
could we not have been stair-steping?
could you not have been stair-steping?
could they not have been stair-steping?