Conjugação do verbo inglês
COULD WHITEN

Verbo regular: whiten - whitened - whitened

Afirmação

Forma simple	Forma com V-ing
I could whiten you could whiten he could whiten we could whiten you could whiten they could whiten	I could be whitening you could be whitening he could be whitening we could be whitening you could be whitening they could be whitening
Perfeito	Perfeito com V-ing
I could have whitened you could have whitened he could have whitened we could have whitened you could have whitened they could have whitened	I could have been whitening you could have been whitening he could have been whitening we could have been whitening you could have been whitening they could have been whitening

Negação

Forma simple	Forma com V-ing
I could not whiten you could not whiten he could not whiten we could not whiten you could not whiten they could not whiten	I could not be whitening you could not be whitening he could not be whitening we could not be whitening you could not be whitening they could not be whitening
Perfeito	Perfeito com V-ing
I could not have whitened you could not have whitened he could not have whitened we could not have whitened you could not have whitened they could not have whitened	I could not have been whitening you could not have been whitening he could not have been whitening we could not have been whitening you could not have been whitening they could not have been whitening

Forma interrogativa

Forma simple	Forma com V-ing
could I whiten? could you whiten? could he whiten? could we whiten? could you whiten? could they whiten?	could I be whitening? could you be whitening? could he be whitening? could we be whitening? could you be whitening? could they be whitening?
Perfeito	Perfeito com V-ing
could I have whitened? could you have whitened? could he have whitened? could we have whitened? could you have whitened? could they have whitened?	could I have been whitening? could you have been whitening? could he have been whitening? could we have been whitening? could you have been whitening? could they have been whitening?

Forma interro-Negação

Forma simple	Forma com V-ing
could I not whiten? could you not whiten? could he not whiten? could we not whiten? could you not whiten? could they not whiten?	could I not be whitening? could you not be whitening? could he not be whitening? could we not be whitening? could you not be whitening? could they not be whitening?
Perfeito	Perfeito com V-ing
could I not have whitened? could you not have whitened? could he not have whitened? could we not have whitened? could you not have whitened? could they not have whitened?	could I not have been whitening? could you not have been whitening? could he not have been whitening? could we not have been whitening? could you not have been whitening? could they not have been whitening?