must interact
Regular verb: interact - interacted- interacted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must interact
you must interact
she must interact
we must interact
you must interact
they must interact 	I must be interacting
you must be interacting
she must be interacting
we must be interacting
you must be interacting
they must be interacting	I must have interacted
you must have interacted
she must have interacted
we must have interacted
you must have interacted
they must have interacted	I must have been interacting
you must have been interacting
she must have been interacting
we must have been interacting
you must have been interacting
they must have been interacting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't interact
you mustn't interact
she mustn't interact
we mustn't interact
you mustn't interact
they mustn't interact 	I mustn't be interacting
you mustn't be interacting
she mustn't be interacting
we mustn't be interacting
you mustn't be interacting
they mustn't be interacting	I mustn't have interacted
you mustn't have interacted
she mustn't have interacted
we mustn't have interacted
you mustn't have interacted
they mustn't have interacted	I mustn't have been interacting
you mustn't have been interacting
she mustn't have been interacting
we mustn't have been interacting
you mustn't have been interacting
they mustn't have been interacting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I interact?
must you interact?
must she interact?
must we interact?
must you interact?
must they interact? 	must I be interacting?
must you be interacting?
must she be interacting?
must we be interacting?
must you be interacting?
must they be interacting? 	must I have interacted?
must you have interacted?
must she have interacted?
must we have interacted?
must you have interacted?
must they have interacted? 	must I have been interacting?
must you have been interacting?
must she have been interacting?
must we have been interacting?
must you have been interacting?
must they have been interacting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I interact?
mustn't you interact?
mustn't she interact?
mustn't we interact?
mustn't you interact?
mustn't they interact? 	mustn't I be interacting?
mustn't you be interacting?
mustn't she be interacting?
mustn't we be interacting?
mustn't you be interacting?
mustn't they be interacting? 	mustn't I have interacted?
mustn't you have interacted?
mustn't she have interacted?
mustn't we have interacted?
mustn't you have interacted?
mustn't they have interacted? 	mustn't I have been interacting?
mustn't you have been interacting?
mustn't she have been interacting?
mustn't we have been interacting?
mustn't you have been interacting?
mustn't they have been interacting?