must play-act
Regular verb: play-act - play-acted- play-acted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must play-act
you must play-act
he must play-act
we must play-act
you must play-act
they must play-act 	I must be play-acting
you must be play-acting
he must be play-acting
we must be play-acting
you must be play-acting
they must be play-acting	I must have play-acted
you must have play-acted
he must have play-acted
we must have play-acted
you must have play-acted
they must have play-acted	I must have been play-acting
you must have been play-acting
he must have been play-acting
we must have been play-acting
you must have been play-acting
they must have been play-acting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't play-act
you mustn't play-act
he mustn't play-act
we mustn't play-act
you mustn't play-act
they mustn't play-act 	I mustn't be play-acting
you mustn't be play-acting
he mustn't be play-acting
we mustn't be play-acting
you mustn't be play-acting
they mustn't be play-acting	I mustn't have play-acted
you mustn't have play-acted
he mustn't have play-acted
we mustn't have play-acted
you mustn't have play-acted
they mustn't have play-acted	I mustn't have been play-acting
you mustn't have been play-acting
he mustn't have been play-acting
we mustn't have been play-acting
you mustn't have been play-acting
they mustn't have been play-acting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I play-act?
must you play-act?
must he play-act?
must we play-act?
must you play-act?
must they play-act? 	must I be play-acting?
must you be play-acting?
must he be play-acting?
must we be play-acting?
must you be play-acting?
must they be play-acting? 	must I have play-acted?
must you have play-acted?
must he have play-acted?
must we have play-acted?
must you have play-acted?
must they have play-acted? 	must I have been play-acting?
must you have been play-acting?
must he have been play-acting?
must we have been play-acting?
must you have been play-acting?
must they have been play-acting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I play-act?
mustn't you play-act?
mustn't he play-act?
mustn't we play-act?
mustn't you play-act?
mustn't they play-act? 	mustn't I be play-acting?
mustn't you be play-acting?
mustn't he be play-acting?
mustn't we be play-acting?
mustn't you be play-acting?
mustn't they be play-acting? 	mustn't I have play-acted?
mustn't you have play-acted?
mustn't he have play-acted?
mustn't we have play-acted?
mustn't you have play-acted?
mustn't they have play-acted? 	mustn't I have been play-acting?
mustn't you have been play-acting?
mustn't he have been play-acting?
mustn't we have been play-acting?
mustn't you have been play-acting?
mustn't they have been play-acting?