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 mustn't change
you mustn't change
he 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
he 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
he 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
he mustn't have been changing
we mustn't have been changing
you mustn't have been changing
they mustn't 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 	
mustn't I change?
mustn't you change?
mustn't he 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 he 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 he 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 he have been changing?
mustn't we have been changing?
mustn't you have been changing?
mustn't they have been changing?