Conjugação do verbo inglês
COULD SUBTRACT

Verbo regular: subtract - subtracted - subtracted

Afirmação

Forma simple	Forma com V-ing
I could subtract you could subtract he could subtract we could subtract you could subtract they could subtract	I could be subtracting you could be subtracting he could be subtracting we could be subtracting you could be subtracting they could be subtracting
Perfeito	Perfeito com V-ing
I could have subtracted you could have subtracted he could have subtracted we could have subtracted you could have subtracted they could have subtracted	I could have been subtracting you could have been subtracting he could have been subtracting we could have been subtracting you could have been subtracting they could have been subtracting

Negação

Forma simple	Forma com V-ing
I could not subtract you could not subtract he could not subtract we could not subtract you could not subtract they could not subtract	I could not be subtracting you could not be subtracting he could not be subtracting we could not be subtracting you could not be subtracting they could not be subtracting
Perfeito	Perfeito com V-ing
I could not have subtracted you could not have subtracted he could not have subtracted we could not have subtracted you could not have subtracted they could not have subtracted	I could not have been subtracting you could not have been subtracting he could not have been subtracting we could not have been subtracting you could not have been subtracting they could not have been subtracting

Forma interrogativa

Forma simple	Forma com V-ing
could I subtract? could you subtract? could he subtract? could we subtract? could you subtract? could they subtract?	could I be subtracting? could you be subtracting? could he be subtracting? could we be subtracting? could you be subtracting? could they be subtracting?
Perfeito	Perfeito com V-ing
could I have subtracted? could you have subtracted? could he have subtracted? could we have subtracted? could you have subtracted? could they have subtracted?	could I have been subtracting? could you have been subtracting? could he have been subtracting? could we have been subtracting? could you have been subtracting? could they have been subtracting?

Forma interro-Negação

Forma simple	Forma com V-ing
could I not subtract? could you not subtract? could he not subtract? could we not subtract? could you not subtract? could they not subtract?	could I not be subtracting? could you not be subtracting? could he not be subtracting? could we not be subtracting? could you not be subtracting? could they not be subtracting?
Perfeito	Perfeito com V-ing
could I not have subtracted? could you not have subtracted? could he not have subtracted? could we not have subtracted? could you not have subtracted? could they not have subtracted?	could I not have been subtracting? could you not have been subtracting? could he not have been subtracting? could we not have been subtracting? could you not have been subtracting? could they not have been subtracting?