must stair-step
Verbe régulier : stair-step - stair-steped- stair-steped

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

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't stair-step
you mustn't stair-step
he mustn't stair-step
we mustn't stair-step
you mustn't stair-step
they mustn't stair-step 	I mustn't be stair-steping
you mustn't be stair-steping
he mustn't be stair-steping
we mustn't be stair-steping
you mustn't be stair-steping
they mustn't be stair-steping	I mustn't have stair-steped
you mustn't have stair-steped
he mustn't have stair-steped
we mustn't have stair-steped
you mustn't have stair-steped
they mustn't have stair-steped	I mustn't have been stair-steping
you mustn't have been stair-steping
he mustn't have been stair-steping
we mustn't have been stair-steping
you mustn't have been stair-steping
they mustn't have been stair-steping	

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

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I stair-step?
mustn't you stair-step?
mustn't he stair-step?
mustn't we stair-step?
mustn't you stair-step?
mustn't they stair-step? 	mustn't I be stair-steping?
mustn't you be stair-steping?
mustn't he be stair-steping?
mustn't we be stair-steping?
mustn't you be stair-steping?
mustn't they be stair-steping? 	mustn't I have stair-steped?
mustn't you have stair-steped?
mustn't he have stair-steped?
mustn't we have stair-steped?
mustn't you have stair-steped?
mustn't they have stair-steped? 	mustn't I have been stair-steping?
mustn't you have been stair-steping?
mustn't he have been stair-steping?
mustn't we have been stair-steping?
mustn't you have been stair-steping?
mustn't they have been stair-steping?