Conjugação do verbo inglês
COULD SIGH

Verbo regular: sigh - sighed - sighed

Afirmação

Forma simple	Forma com V-ing
I could sigh you could sigh he could sigh we could sigh you could sigh they could sigh	I could be sighing you could be sighing he could be sighing we could be sighing you could be sighing they could be sighing
Perfeito	Perfeito com V-ing
I could have sighed you could have sighed he 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 he 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
I couldn't sigh you couldn't sigh he couldn't sigh we couldn't sigh you couldn't sigh they couldn't sigh	I couldn't be sighing you couldn't be sighing he couldn't be sighing we couldn't be sighing you couldn't be sighing they couldn't be sighing
Perfeito	Perfeito com V-ing
I couldn't have sighed you couldn't have sighed he couldn't have sighed we couldn't have sighed you couldn't have sighed they couldn't have sighed	I couldn't have been sighing you couldn't have been sighing he couldn't have been sighing we couldn't have been sighing you couldn't have been sighing they couldn't have been sighing

Forma interrogativa

Forma simple	Forma com V-ing
could I sigh? could you sigh? could he sigh? could we sigh? could you sigh? could they sigh?	could I be sighing? could you be sighing? could he be sighing? could we be sighing? could you be sighing? could they be sighing?
Perfeito	Perfeito com V-ing
could I have sighed? could you have sighed? could he 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 he 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
couldn't I sigh? couldn't you sigh? couldn't he sigh? couldn't we sigh? couldn't you sigh? couldn't they sigh?	couldn't I be sighing? couldn't you be sighing? couldn't he be sighing? couldn't we be sighing? couldn't you be sighing? couldn't they be sighing?
Perfeito	Perfeito com V-ing
couldn't I have sighed? couldn't you have sighed? couldn't he have sighed? couldn't we have sighed? couldn't you have sighed? couldn't they have sighed?	couldn't I have been sighing? couldn't you have been sighing? couldn't he have been sighing? couldn't we have been sighing? couldn't you have been sighing? couldn't they have been sighing?