must embitter
Verbo regular: embitter - embittered- embittered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must embitter
you must embitter
he must embitter
we must embitter
you must embitter
they must embitter 	I must be embittering
you must be embittering
he must be embittering
we must be embittering
you must be embittering
they must be embittering	I must have embittered
you must have embittered
he must have embittered
we must have embittered
you must have embittered
they must have embittered	I must have been embittering
you must have been embittering
he must have been embittering
we must have been embittering
you must have been embittering
they must have been embittering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't embitter
you mustn't embitter
he mustn't embitter
we mustn't embitter
you mustn't embitter
they mustn't embitter 	I mustn't be embittering
you mustn't be embittering
he mustn't be embittering
we mustn't be embittering
you mustn't be embittering
they mustn't be embittering	I mustn't have embittered
you mustn't have embittered
he mustn't have embittered
we mustn't have embittered
you mustn't have embittered
they mustn't have embittered	I mustn't have been embittering
you mustn't have been embittering
he mustn't have been embittering
we mustn't have been embittering
you mustn't have been embittering
they mustn't have been embittering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I embitter?
must you embitter?
must he embitter?
must we embitter?
must you embitter?
must they embitter? 	must I be embittering?
must you be embittering?
must he be embittering?
must we be embittering?
must you be embittering?
must they be embittering? 	must I have embittered?
must you have embittered?
must he have embittered?
must we have embittered?
must you have embittered?
must they have embittered? 	must I have been embittering?
must you have been embittering?
must he have been embittering?
must we have been embittering?
must you have been embittering?
must they have been embittering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I embitter?
mustn't you embitter?
mustn't he embitter?
mustn't we embitter?
mustn't you embitter?
mustn't they embitter? 	mustn't I be embittering?
mustn't you be embittering?
mustn't he be embittering?
mustn't we be embittering?
mustn't you be embittering?
mustn't they be embittering? 	mustn't I have embittered?
mustn't you have embittered?
mustn't he have embittered?
mustn't we have embittered?
mustn't you have embittered?
mustn't they have embittered? 	mustn't I have been embittering?
mustn't you have been embittering?
mustn't he have been embittering?
mustn't we have been embittering?
mustn't you have been embittering?
mustn't they have been embittering?