must react
Regular verb: react - reacted- reacted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must react
you must react
he must react
we must react
you must react
they must react 	I must be reacting
you must be reacting
he must be reacting
we must be reacting
you must be reacting
they must be reacting	I must have reacted
you must have reacted
he must have reacted
we must have reacted
you must have reacted
they must have reacted	I must have been reacting
you must have been reacting
he must have been reacting
we must have been reacting
you must have been reacting
they must have been reacting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't react
you mustn't react
he mustn't react
we mustn't react
you mustn't react
they mustn't react 	I mustn't be reacting
you mustn't be reacting
he mustn't be reacting
we mustn't be reacting
you mustn't be reacting
they mustn't be reacting	I mustn't have reacted
you mustn't have reacted
he mustn't have reacted
we mustn't have reacted
you mustn't have reacted
they mustn't have reacted	I mustn't have been reacting
you mustn't have been reacting
he mustn't have been reacting
we mustn't have been reacting
you mustn't have been reacting
they mustn't have been reacting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I react?
must you react?
must he react?
must we react?
must you react?
must they react? 	must I be reacting?
must you be reacting?
must he be reacting?
must we be reacting?
must you be reacting?
must they be reacting? 	must I have reacted?
must you have reacted?
must he have reacted?
must we have reacted?
must you have reacted?
must they have reacted? 	must I have been reacting?
must you have been reacting?
must he have been reacting?
must we have been reacting?
must you have been reacting?
must they have been reacting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I react?
mustn't you react?
mustn't he react?
mustn't we react?
mustn't you react?
mustn't they react? 	mustn't I be reacting?
mustn't you be reacting?
mustn't he be reacting?
mustn't we be reacting?
mustn't you be reacting?
mustn't they be reacting? 	mustn't I have reacted?
mustn't you have reacted?
mustn't he have reacted?
mustn't we have reacted?
mustn't you have reacted?
mustn't they have reacted? 	mustn't I have been reacting?
mustn't you have been reacting?
mustn't he have been reacting?
mustn't we have been reacting?
mustn't you have been reacting?
mustn't they have been reacting?