Conjugación del verbo inglés
COULD REF

Verbo regular: ref - refed - refed

Afirmación

Forma simple	Forma con V-ing
I could ref you could ref she could ref we could ref you could ref they could ref	I could be refing you could be refing she could be refing we could be refing you could be refing they could be refing
Perfecto	Perfecto con V-ing
I could have refed you could have refed she could have refed we could have refed you could have refed they could have refed	I could have been refing you could have been refing she could have been refing we could have been refing you could have been refing they could have been refing

Negación

Forma simple	Forma con V-ing
I could not ref you could not ref she could not ref we could not ref you could not ref they could not ref	I could not be refing you could not be refing she could not be refing we could not be refing you could not be refing they could not be refing
Perfecto	Perfecto con V-ing
I could not have refed you could not have refed she could not have refed we could not have refed you could not have refed they could not have refed	I could not have been refing you could not have been refing she could not have been refing we could not have been refing you could not have been refing they could not have been refing

Forma interrogativa

Forma simple	Forma con V-ing
could I ref? could you ref? could she ref? could we ref? could you ref? could they ref?	could I be refing? could you be refing? could she be refing? could we be refing? could you be refing? could they be refing?
Perfecto	Perfecto con V-ing
could I have refed? could you have refed? could she have refed? could we have refed? could you have refed? could they have refed?	could I have been refing? could you have been refing? could she have been refing? could we have been refing? could you have been refing? could they have been refing?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not ref? could you not ref? could she not ref? could we not ref? could you not ref? could they not ref?	could I not be refing? could you not be refing? could she not be refing? could we not be refing? could you not be refing? could they not be refing?
Perfecto	Perfecto con V-ing
could I not have refed? could you not have refed? could she not have refed? could we not have refed? could you not have refed? could they not have refed?	could I not have been refing? could you not have been refing? could she not have been refing? could we not have been refing? could you not have been refing? could they not have been refing?