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 couldn't subtract you couldn't subtract he couldn't subtract we couldn't subtract you couldn't subtract they couldn't subtract	I couldn't be subtracting you couldn't be subtracting he couldn't be subtracting we couldn't be subtracting you couldn't be subtracting they couldn't be subtracting
Perfeito	Perfeito com V-ing
I couldn't have subtracted you couldn't have subtracted he couldn't have subtracted we couldn't have subtracted you couldn't have subtracted they couldn't have subtracted	I couldn't have been subtracting you couldn't have been subtracting he couldn't have been subtracting we couldn't have been subtracting you couldn't have been subtracting they couldn't 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
couldn't I subtract? couldn't you subtract? couldn't he subtract? couldn't we subtract? couldn't you subtract? couldn't they subtract?	couldn't I be subtracting? couldn't you be subtracting? couldn't he be subtracting? couldn't we be subtracting? couldn't you be subtracting? couldn't they be subtracting?
Perfeito	Perfeito com V-ing
couldn't I have subtracted? couldn't you have subtracted? couldn't he have subtracted? couldn't we have subtracted? couldn't you have subtracted? couldn't they have subtracted?	couldn't I have been subtracting? couldn't you have been subtracting? couldn't he have been subtracting? couldn't we have been subtracting? couldn't you have been subtracting? couldn't they have been subtracting?