must chastise
Regular verb: chastise - chastised- chastised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must chastise
you must chastise
she must chastise
we must chastise
you must chastise
they must chastise 	I must be chastising
you must be chastising
she must be chastising
we must be chastising
you must be chastising
they must be chastising	I must have chastised
you must have chastised
she 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
she 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
she 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
she 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
she 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
she 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 she chastise?
must we chastise?
must you chastise?
must they chastise? 	must I be chastising?
must you be chastising?
must she be chastising?
must we be chastising?
must you be chastising?
must they be chastising? 	must I have chastised?
must you have chastised?
must she 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 she 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 she 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 she 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 she 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 she have been chastising?
mustn't we have been chastising?
mustn't you have been chastising?
mustn't they have been chastising?