must change
Regular verb: change - changed- changed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must change
you must change
she must change
we must change
you must change
they must change 	I must be changing
you must be changing
she must be changing
we must be changing
you must be changing
they must be changing	I must have changed
you must have changed
she must have changed
we must have changed
you must have changed
they must have changed	I must have been changing
you must have been changing
she must have been changing
we must have been changing
you must have been changing
they must have been changing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't change
you mustn't change
she mustn't change
we mustn't change
you mustn't change
they mustn't change 	I mustn't be changing
you mustn't be changing
she mustn't be changing
we mustn't be changing
you mustn't be changing
they mustn't be changing	I mustn't have changed
you mustn't have changed
she mustn't have changed
we mustn't have changed
you mustn't have changed
they mustn't have changed	I mustn't have been changing
you mustn't have been changing
she mustn't have been changing
we mustn't have been changing
you mustn't have been changing
they mustn't have been changing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I change?
must you change?
must she change?
must we change?
must you change?
must they change? 	must I be changing?
must you be changing?
must she be changing?
must we be changing?
must you be changing?
must they be changing? 	must I have changed?
must you have changed?
must she have changed?
must we have changed?
must you have changed?
must they have changed? 	must I have been changing?
must you have been changing?
must she have been changing?
must we have been changing?
must you have been changing?
must they have been changing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I change?
mustn't you change?
mustn't she change?
mustn't we change?
mustn't you change?
mustn't they change? 	mustn't I be changing?
mustn't you be changing?
mustn't she be changing?
mustn't we be changing?
mustn't you be changing?
mustn't they be changing? 	mustn't I have changed?
mustn't you have changed?
mustn't she have changed?
mustn't we have changed?
mustn't you have changed?
mustn't they have changed? 	mustn't I have been changing?
mustn't you have been changing?
mustn't she have been changing?
mustn't we have been changing?
mustn't you have been changing?
mustn't they have been changing?