Conjugación del verbo inglés
COULD EXIST

Verbo regular: exist - existed - existed

Afirmación

Forma simple	Forma con V-ing
I could exist you could exist she could exist we could exist you could exist they could exist	I could be existing you could be existing she could be existing we could be existing you could be existing they could be existing
Perfecto	Perfecto con V-ing
I could have existed you could have existed she could have existed we could have existed you could have existed they could have existed	I could have been existing you could have been existing she could have been existing we could have been existing you could have been existing they could have been existing

Negación

Forma simple	Forma con V-ing
I couldn't exist you couldn't exist she couldn't exist we couldn't exist you couldn't exist they couldn't exist	I couldn't be existing you couldn't be existing she couldn't be existing we couldn't be existing you couldn't be existing they couldn't be existing
Perfecto	Perfecto con V-ing
I couldn't have existed you couldn't have existed she couldn't have existed we couldn't have existed you couldn't have existed they couldn't have existed	I couldn't have been existing you couldn't have been existing she couldn't have been existing we couldn't have been existing you couldn't have been existing they couldn't have been existing

Forma interrogativa

Forma simple	Forma con V-ing
could I exist? could you exist? could she exist? could we exist? could you exist? could they exist?	could I be existing? could you be existing? could she be existing? could we be existing? could you be existing? could they be existing?
Perfecto	Perfecto con V-ing
could I have existed? could you have existed? could she have existed? could we have existed? could you have existed? could they have existed?	could I have been existing? could you have been existing? could she have been existing? could we have been existing? could you have been existing? could they have been existing?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I exist? couldn't you exist? couldn't she exist? couldn't we exist? couldn't you exist? couldn't they exist?	couldn't I be existing? couldn't you be existing? couldn't she be existing? couldn't we be existing? couldn't you be existing? couldn't they be existing?
Perfecto	Perfecto con V-ing
couldn't I have existed? couldn't you have existed? couldn't she have existed? couldn't we have existed? couldn't you have existed? couldn't they have existed?	couldn't I have been existing? couldn't you have been existing? couldn't she have been existing? couldn't we have been existing? couldn't you have been existing? couldn't they have been existing?