Conjugação do verbo inglês
COULD REFINE

Verbo regular: refine - refined - refined

Afirmação

Forma simple	Forma com V-ing
I could refine you could refine he could refine we could refine you could refine they could refine	I could be refining you could be refining he could be refining we could be refining you could be refining they could be refining
Perfeito	Perfeito com V-ing
I could have refined you could have refined he could have refined we could have refined you could have refined they could have refined	I could have been refining you could have been refining he could have been refining we could have been refining you could have been refining they could have been refining

Negação

Forma simple	Forma com V-ing
I could not refine you could not refine he could not refine we could not refine you could not refine they could not refine	I could not be refining you could not be refining he could not be refining we could not be refining you could not be refining they could not be refining
Perfeito	Perfeito com V-ing
I could not have refined you could not have refined he could not have refined we could not have refined you could not have refined they could not have refined	I could not have been refining you could not have been refining he could not have been refining we could not have been refining you could not have been refining they could not have been refining

Forma interrogativa

Forma simple	Forma com V-ing
could I refine? could you refine? could he refine? could we refine? could you refine? could they refine?	could I be refining? could you be refining? could he be refining? could we be refining? could you be refining? could they be refining?
Perfeito	Perfeito com V-ing
could I have refined? could you have refined? could he have refined? could we have refined? could you have refined? could they have refined?	could I have been refining? could you have been refining? could he have been refining? could we have been refining? could you have been refining? could they have been refining?

Forma interro-Negação

Forma simple	Forma com V-ing
could I not refine? could you not refine? could he not refine? could we not refine? could you not refine? could they not refine?	could I not be refining? could you not be refining? could he not be refining? could we not be refining? could you not be refining? could they not be refining?
Perfeito	Perfeito com V-ing
could I not have refined? could you not have refined? could he not have refined? could we not have refined? could you not have refined? could they not have refined?	could I not have been refining? could you not have been refining? could he not have been refining? could we not have been refining? could you not have been refining? could they not have been refining?