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 must not change
you must not change
she must not change
we must not change
you must not change
they must not change 	I must not be changing
you must not be changing
she must not be changing
we must not be changing
you must not be changing
they must not be changing	I must not have changed
you must not have changed
she must not have changed
we must not have changed
you must not have changed
they must not have changed	I must not have been changing
you must not have been changing
she must not have been changing
we must not have been changing
you must not have been changing
they must not 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 	
must I not change?
must you not change?
must she not change?
must we not change?
must you not change?
must they not change? 	must I not be changing?
must you not be changing?
must she not be changing?
must we not be changing?
must you not be changing?
must they not be changing? 	must I not have changed?
must you not have changed?
must she not have changed?
must we not have changed?
must you not have changed?
must they not have changed? 	must I not have been changing?
must you not have been changing?
must she not have been changing?
must we not have been changing?
must you not have been changing?
must they not have been changing?