could sigh
Verbo regular: sigh - sighed- sighed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could sigh
you could sigh
she could sigh
we could sigh
you could sigh
they could sigh 	I could be sighing
you could be sighing
she could be sighing
we could be sighing
you could be sighing
they could be sighing	I could have sighed
you could have sighed
she could have sighed
we could have sighed
you could have sighed
they could have sighed	I could have been sighing
you could have been sighing
she could have been sighing
we could have been sighing
you could have been sighing
they could have been sighing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not sigh
you could not sigh
she could not sigh
we could not sigh
you could not sigh
they could not sigh 	I could not be sighing
you could not be sighing
she could not be sighing
we could not be sighing
you could not be sighing
they could not be sighing	I could not have sighed
you could not have sighed
she could not have sighed
we could not have sighed
you could not have sighed
they could not have sighed	I could not have been sighing
you could not have been sighing
she could not have been sighing
we could not have been sighing
you could not have been sighing
they could not have been sighing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I sigh?
could you sigh?
could she sigh?
could we sigh?
could you sigh?
could they sigh? 	could I be sighing?
could you be sighing?
could she be sighing?
could we be sighing?
could you be sighing?
could they be sighing? 	could I have sighed?
could you have sighed?
could she have sighed?
could we have sighed?
could you have sighed?
could they have sighed? 	could I have been sighing?
could you have been sighing?
could she have been sighing?
could we have been sighing?
could you have been sighing?
could they have been sighing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not sigh?
could you not sigh?
could she not sigh?
could we not sigh?
could you not sigh?
could they not sigh? 	could I not be sighing?
could you not be sighing?
could she not be sighing?
could we not be sighing?
could you not be sighing?
could they not be sighing? 	could I not have sighed?
could you not have sighed?
could she not have sighed?
could we not have sighed?
could you not have sighed?
could they not have sighed? 	could I not have been sighing?
could you not have been sighing?
could she not have been sighing?
could we not have been sighing?
could you not have been sighing?
could they not have been sighing?