must change
Verbo regular: change - changed- changed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must change
you must change
he must change
we must change
you must change
they must change 	I must be changing
you must be changing
he must be changing
we must be changing
you must be changing
they must be changing	I must have changed
you must have changed
he 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
he must have been changing
we must have been changing
you must have been changing
they must have been changing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not change
you must not change
he 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
he 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
he 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
he must not have been changing
we must not have been changing
you must not have been changing
they must not have been changing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I change?
must you change?
must he change?
must we change?
must you change?
must they change? 	must I be changing?
must you be changing?
must he be changing?
must we be changing?
must you be changing?
must they be changing? 	must I have changed?
must you have changed?
must he 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 he have been changing?
must we have been changing?
must you have been changing?
must they have been changing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not change?
must you not change?
must he 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 he 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 he 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 he not have been changing?
must we not have been changing?
must you not have been changing?
must they not have been changing?