must chastise
Regular verb: chastise - chastised- chastised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must chastise
you must chastise
he must chastise
we must chastise
you must chastise
they must chastise 	I must be chastising
you must be chastising
he must be chastising
we must be chastising
you must be chastising
they must be chastising	I must have chastised
you must have chastised
he must have chastised
we must have chastised
you must have chastised
they must have chastised	I must have been chastising
you must have been chastising
he must have been chastising
we must have been chastising
you must have been chastising
they must have been chastising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't chastise
you mustn't chastise
he mustn't chastise
we mustn't chastise
you mustn't chastise
they mustn't chastise 	I mustn't be chastising
you mustn't be chastising
he mustn't be chastising
we mustn't be chastising
you mustn't be chastising
they mustn't be chastising	I mustn't have chastised
you mustn't have chastised
he mustn't have chastised
we mustn't have chastised
you mustn't have chastised
they mustn't have chastised	I mustn't have been chastising
you mustn't have been chastising
he mustn't have been chastising
we mustn't have been chastising
you mustn't have been chastising
they mustn't have been chastising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I chastise?
must you chastise?
must he chastise?
must we chastise?
must you chastise?
must they chastise? 	must I be chastising?
must you be chastising?
must he be chastising?
must we be chastising?
must you be chastising?
must they be chastising? 	must I have chastised?
must you have chastised?
must he have chastised?
must we have chastised?
must you have chastised?
must they have chastised? 	must I have been chastising?
must you have been chastising?
must he have been chastising?
must we have been chastising?
must you have been chastising?
must they have been chastising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I chastise?
mustn't you chastise?
mustn't he chastise?
mustn't we chastise?
mustn't you chastise?
mustn't they chastise? 	mustn't I be chastising?
mustn't you be chastising?
mustn't he be chastising?
mustn't we be chastising?
mustn't you be chastising?
mustn't they be chastising? 	mustn't I have chastised?
mustn't you have chastised?
mustn't he have chastised?
mustn't we have chastised?
mustn't you have chastised?
mustn't they have chastised? 	mustn't I have been chastising?
mustn't you have been chastising?
mustn't he have been chastising?
mustn't we have been chastising?
mustn't you have been chastising?
mustn't they have been chastising?