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 must not embitter
you must not embitter
he must not embitter
we must not embitter
you must not embitter
they must not embitter 	I must not be embittering
you must not be embittering
he must not be embittering
we must not be embittering
you must not be embittering
they must not be embittering	I must not have embittered
you must not have embittered
he must not have embittered
we must not have embittered
you must not have embittered
they must not have embittered	I must not have been embittering
you must not have been embittering
he must not have been embittering
we must not have been embittering
you must not have been embittering
they must not 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 	
must I not embitter?
must you not embitter?
must he not embitter?
must we not embitter?
must you not embitter?
must they not embitter? 	must I not be embittering?
must you not be embittering?
must he not be embittering?
must we not be embittering?
must you not be embittering?
must they not be embittering? 	must I not have embittered?
must you not have embittered?
must he not have embittered?
must we not have embittered?
must you not have embittered?
must they not have embittered? 	must I not have been embittering?
must you not have been embittering?
must he not have been embittering?
must we not have been embittering?
must you not have been embittering?
must they not have been embittering?