must unstep
Regular verb: unstep - unsteped- unsteped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must unstep
you must unstep
she must unstep
we must unstep
you must unstep
they must unstep 	I must be unsteping
you must be unsteping
she must be unsteping
we must be unsteping
you must be unsteping
they must be unsteping	I must have unsteped
you must have unsteped
she 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
she must have been unsteping
we must have been unsteping
you must have been unsteping
they must have been unsteping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not unstep
you must not unstep
she must not unstep
we must not unstep
you must not unstep
they must not unstep 	I must not be unsteping
you must not be unsteping
she must not be unsteping
we must not be unsteping
you must not be unsteping
they must not be unsteping	I must not have unsteped
you must not have unsteped
she must not have unsteped
we must not have unsteped
you must not have unsteped
they must not have unsteped	I must not have been unsteping
you must not have been unsteping
she must not have been unsteping
we must not have been unsteping
you must not have been unsteping
they must not have been unsteping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I unstep?
must you unstep?
must she unstep?
must we unstep?
must you unstep?
must they unstep? 	must I be unsteping?
must you be unsteping?
must she be unsteping?
must we be unsteping?
must you be unsteping?
must they be unsteping? 	must I have unsteped?
must you have unsteped?
must she 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 she have been unsteping?
must we have been unsteping?
must you have been unsteping?
must they have been unsteping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not unstep?
must you not unstep?
must she not unstep?
must we not unstep?
must you not unstep?
must they not unstep? 	must I not be unsteping?
must you not be unsteping?
must she not be unsteping?
must we not be unsteping?
must you not be unsteping?
must they not be unsteping? 	must I not have unsteped?
must you not have unsteped?
must she not have unsteped?
must we not have unsteped?
must you not have unsteped?
must they not have unsteped? 	must I not have been unsteping?
must you not have been unsteping?
must she not have been unsteping?
must we not have been unsteping?
must you not have been unsteping?
must they not have been unsteping?