I could sigh you could sigh he could sigh we could sigh you could sigh they could sigh
Forma con V-ing
I could be sighing you could be sighing he could be sighing we could be sighing you could be sighing they could be sighing
Perfecto
I could have sighed you could have sighed he could have sighed we could have sighed you could have sighed they could have sighed
Perfecto con V-ing
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
Negación
Forma simple
I couldn't sigh you couldn't sigh he couldn't sigh we couldn't sigh you couldn't sigh they couldn't sigh
Forma con V-ing
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
Perfecto
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
Perfecto con V-ing
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
could I sigh? could you sigh? could he sigh? could we sigh? could you sigh? could they sigh?
Forma con V-ing
could I be sighing? could you be sighing? could he be sighing? could we be sighing? could you be sighing? could they be sighing?
Perfecto
could I have sighed? could you have sighed? could he have sighed? could we have sighed? could you have sighed? could they have sighed?
Perfecto con V-ing
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-negativa
Forma simple
couldn't I sigh? couldn't you sigh? couldn't he sigh? couldn't we sigh? couldn't you sigh? couldn't they sigh?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?