could embitter
Verbo regular: embitter - embittered- embittered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could embitter
you could embitter
he could embitter
we could embitter
you could embitter
they could embitter 	I could be embittering
you could be embittering
he could be embittering
we could be embittering
you could be embittering
they could be embittering	I could have embittered
you could have embittered
he could have embittered
we could have embittered
you could have embittered
they could have embittered	I could have been embittering
you could have been embittering
he could have been embittering
we could have been embittering
you could have been embittering
they could have been embittering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not embitter
you could not embitter
he could not embitter
we could not embitter
you could not embitter
they could not embitter 	I could not be embittering
you could not be embittering
he could not be embittering
we could not be embittering
you could not be embittering
they could not be embittering	I could not have embittered
you could not have embittered
he could not have embittered
we could not have embittered
you could not have embittered
they could not have embittered	I could not have been embittering
you could not have been embittering
he could not have been embittering
we could not have been embittering
you could not have been embittering
they could not have been embittering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I embitter?
could you embitter?
could he embitter?
could we embitter?
could you embitter?
could they embitter? 	could I be embittering?
could you be embittering?
could he be embittering?
could we be embittering?
could you be embittering?
could they be embittering? 	could I have embittered?
could you have embittered?
could he have embittered?
could we have embittered?
could you have embittered?
could they have embittered? 	could I have been embittering?
could you have been embittering?
could he have been embittering?
could we have been embittering?
could you have been embittering?
could they have been embittering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not embitter?
could you not embitter?
could he not embitter?
could we not embitter?
could you not embitter?
could they not embitter? 	could I not be embittering?
could you not be embittering?
could he not be embittering?
could we not be embittering?
could you not be embittering?
could they not be embittering? 	could I not have embittered?
could you not have embittered?
could he not have embittered?
could we not have embittered?
could you not have embittered?
could they not have embittered? 	could I not have been embittering?
could you not have been embittering?
could he not have been embittering?
could we not have been embittering?
could you not have been embittering?
could they not have been embittering?