Conjugação do verbo inglês
COULD SUBTRACT

Verbo regular: subtract - subtracted - subtracted

Afirmação

Forma simple	Forma com V-ing
I could subtract you could subtract she could subtract we could subtract you could subtract they could subtract	I could be subtracting you could be subtracting she 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 she 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 she 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 she 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 she 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 she 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 she 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 she subtract? could we subtract? could you subtract? could they subtract?	could I be subtracting? could you be subtracting? could she 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 she 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 she 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 she 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 she 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 she 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 she have been subtracting? couldn't we have been subtracting? couldn't you have been subtracting? couldn't they have been subtracting?