must eighty-six
Regular verb: eighty-six - eighty-sixed- eighty-sixed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must eighty-six
you must eighty-six
she must eighty-six
we must eighty-six
you must eighty-six
they must eighty-six 	I must be eighty-sixing
you must be eighty-sixing
she must be eighty-sixing
we must be eighty-sixing
you must be eighty-sixing
they must be eighty-sixing	I must have eighty-sixed
you must have eighty-sixed
she must have eighty-sixed
we must have eighty-sixed
you must have eighty-sixed
they must have eighty-sixed	I must have been eighty-sixing
you must have been eighty-sixing
she must have been eighty-sixing
we must have been eighty-sixing
you must have been eighty-sixing
they must have been eighty-sixing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not eighty-six
you must not eighty-six
she must not eighty-six
we must not eighty-six
you must not eighty-six
they must not eighty-six 	I must not be eighty-sixing
you must not be eighty-sixing
she must not be eighty-sixing
we must not be eighty-sixing
you must not be eighty-sixing
they must not be eighty-sixing	I must not have eighty-sixed
you must not have eighty-sixed
she must not have eighty-sixed
we must not have eighty-sixed
you must not have eighty-sixed
they must not have eighty-sixed	I must not have been eighty-sixing
you must not have been eighty-sixing
she must not have been eighty-sixing
we must not have been eighty-sixing
you must not have been eighty-sixing
they must not have been eighty-sixing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I eighty-six?
must you eighty-six?
must she eighty-six?
must we eighty-six?
must you eighty-six?
must they eighty-six? 	must I be eighty-sixing?
must you be eighty-sixing?
must she be eighty-sixing?
must we be eighty-sixing?
must you be eighty-sixing?
must they be eighty-sixing? 	must I have eighty-sixed?
must you have eighty-sixed?
must she have eighty-sixed?
must we have eighty-sixed?
must you have eighty-sixed?
must they have eighty-sixed? 	must I have been eighty-sixing?
must you have been eighty-sixing?
must she have been eighty-sixing?
must we have been eighty-sixing?
must you have been eighty-sixing?
must they have been eighty-sixing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not eighty-six?
must you not eighty-six?
must she not eighty-six?
must we not eighty-six?
must you not eighty-six?
must they not eighty-six? 	must I not be eighty-sixing?
must you not be eighty-sixing?
must she not be eighty-sixing?
must we not be eighty-sixing?
must you not be eighty-sixing?
must they not be eighty-sixing? 	must I not have eighty-sixed?
must you not have eighty-sixed?
must she not have eighty-sixed?
must we not have eighty-sixed?
must you not have eighty-sixed?
must they not have eighty-sixed? 	must I not have been eighty-sixing?
must you not have been eighty-sixing?
must she not have been eighty-sixing?
must we not have been eighty-sixing?
must you not have been eighty-sixing?
must they not have been eighty-sixing?