must unstep
Verbe régulier : unstep - unsteped- unsteped

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must unstep
you must unstep
he must unstep
we must unstep
you must unstep
they must unstep 	I must be unsteping
you must be unsteping
he must be unsteping
we must be unsteping
you must be unsteping
they must be unsteping	I must have unsteped
you must have unsteped
he must have unsteped
we must have unsteped
you must have unsteped
they must have unsteped	I must have been unsteping
you must have been unsteping
he must have been unsteping
we must have been unsteping
you must have been unsteping
they must have been unsteping	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't unstep
you mustn't unstep
he mustn't unstep
we mustn't unstep
you mustn't unstep
they mustn't unstep 	I mustn't be unsteping
you mustn't be unsteping
he mustn't be unsteping
we mustn't be unsteping
you mustn't be unsteping
they mustn't be unsteping	I mustn't have unsteped
you mustn't have unsteped
he mustn't have unsteped
we mustn't have unsteped
you mustn't have unsteped
they mustn't have unsteped	I mustn't have been unsteping
you mustn't have been unsteping
he mustn't have been unsteping
we mustn't have been unsteping
you mustn't have been unsteping
they mustn't have been unsteping	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I unstep?
must you unstep?
must he unstep?
must we unstep?
must you unstep?
must they unstep? 	must I be unsteping?
must you be unsteping?
must he be unsteping?
must we be unsteping?
must you be unsteping?
must they be unsteping? 	must I have unsteped?
must you have unsteped?
must he have unsteped?
must we have unsteped?
must you have unsteped?
must they have unsteped? 	must I have been unsteping?
must you have been unsteping?
must he have been unsteping?
must we have been unsteping?
must you have been unsteping?
must they have been unsteping? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I unstep?
mustn't you unstep?
mustn't he unstep?
mustn't we unstep?
mustn't you unstep?
mustn't they unstep? 	mustn't I be unsteping?
mustn't you be unsteping?
mustn't he be unsteping?
mustn't we be unsteping?
mustn't you be unsteping?
mustn't they be unsteping? 	mustn't I have unsteped?
mustn't you have unsteped?
mustn't he have unsteped?
mustn't we have unsteped?
mustn't you have unsteped?
mustn't they have unsteped? 	mustn't I have been unsteping?
mustn't you have been unsteping?
mustn't he have been unsteping?
mustn't we have been unsteping?
mustn't you have been unsteping?
mustn't they have been unsteping?