I could worry you could worry he could worry we could worry you could worry they could worry
Forma con V-ing
I could be worrying you could be worrying he could be worrying we could be worrying you could be worrying they could be worrying
Perfecto
I could have worried you could have worried he could have worried we could have worried you could have worried they could have worried
Perfecto con V-ing
I could have been worrying you could have been worrying he could have been worrying we could have been worrying you could have been worrying they could have been worrying
Negación
Forma simple
I couldn't worry you couldn't worry he couldn't worry we couldn't worry you couldn't worry they couldn't worry
Forma con V-ing
I couldn't be worrying you couldn't be worrying he couldn't be worrying we couldn't be worrying you couldn't be worrying they couldn't be worrying
Perfecto
I couldn't have worried you couldn't have worried he couldn't have worried we couldn't have worried you couldn't have worried they couldn't have worried
Perfecto con V-ing
I couldn't have been worrying you couldn't have been worrying he couldn't have been worrying we couldn't have been worrying you couldn't have been worrying they couldn't have been worrying
Forma interrogativa
Forma simple
could I worry? could you worry? could he worry? could we worry? could you worry? could they worry?
Forma con V-ing
could I be worrying? could you be worrying? could he be worrying? could we be worrying? could you be worrying? could they be worrying?
Perfecto
could I have worried? could you have worried? could he have worried? could we have worried? could you have worried? could they have worried?
Perfecto con V-ing
could I have been worrying? could you have been worrying? could he have been worrying? could we have been worrying? could you have been worrying? could they have been worrying?
Forma interro-negativa
Forma simple
couldn't I worry? couldn't you worry? couldn't he worry? couldn't we worry? couldn't you worry? couldn't they worry?
Forma con V-ing
couldn't I be worrying? couldn't you be worrying? couldn't he be worrying? couldn't we be worrying? couldn't you be worrying? couldn't they be worrying?
Perfecto
couldn't I have worried? couldn't you have worried? couldn't he have worried? couldn't we have worried? couldn't you have worried? couldn't they have worried?
Perfecto con V-ing
couldn't I have been worrying? couldn't you have been worrying? couldn't he have been worrying? couldn't we have been worrying? couldn't you have been worrying? couldn't they have been worrying?