Conjugação do verbo inglês
COULD REF

Verbo regular: ref - refed - refed

Afirmação

Forma simple	Forma com V-ing
I could ref you could ref he could ref we could ref you could ref they could ref	I could be refing you could be refing he could be refing we could be refing you could be refing they could be refing
Perfeito	Perfeito com V-ing
I could have refed you could have refed he 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 he could have been refing we could have been refing you could have been refing they could have been refing

Negação

Forma simple	Forma com V-ing
I couldn't ref you couldn't ref he couldn't ref we couldn't ref you couldn't ref they couldn't ref	I couldn't be refing you couldn't be refing he couldn't be refing we couldn't be refing you couldn't be refing they couldn't be refing
Perfeito	Perfeito com V-ing
I couldn't have refed you couldn't have refed he couldn't have refed we couldn't have refed you couldn't have refed they couldn't have refed	I couldn't have been refing you couldn't have been refing he couldn't have been refing we couldn't have been refing you couldn't have been refing they couldn't have been refing

Forma interrogativa

Forma simple	Forma com V-ing
could I ref? could you ref? could he ref? could we ref? could you ref? could they ref?	could I be refing? could you be refing? could he be refing? could we be refing? could you be refing? could they be refing?
Perfeito	Perfeito com V-ing
could I have refed? could you have refed? could he 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 he have been refing? could we have been refing? could you have been refing? could they have been refing?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I ref? couldn't you ref? couldn't he ref? couldn't we ref? couldn't you ref? couldn't they ref?	couldn't I be refing? couldn't you be refing? couldn't he be refing? couldn't we be refing? couldn't you be refing? couldn't they be refing?
Perfeito	Perfeito com V-ing
couldn't I have refed? couldn't you have refed? couldn't he have refed? couldn't we have refed? couldn't you have refed? couldn't they have refed?	couldn't I have been refing? couldn't you have been refing? couldn't he have been refing? couldn't we have been refing? couldn't you have been refing? couldn't they have been refing?