Conjugação do verbo inglês
COULD THUMBTACK

Verbo regular: thumbtack - thumbtacked - thumbtacked

Afirmação

Forma simple	Forma com V-ing
I could thumbtack you could thumbtack he could thumbtack we could thumbtack you could thumbtack they could thumbtack	I could be thumbtacking you could be thumbtacking he could be thumbtacking we could be thumbtacking you could be thumbtacking they could be thumbtacking
Perfeito	Perfeito com V-ing
I could have thumbtacked you could have thumbtacked he could have thumbtacked we could have thumbtacked you could have thumbtacked they could have thumbtacked	I could have been thumbtacking you could have been thumbtacking he could have been thumbtacking we could have been thumbtacking you could have been thumbtacking they could have been thumbtacking

Negação

Forma simple	Forma com V-ing
I could not thumbtack you could not thumbtack he could not thumbtack we could not thumbtack you could not thumbtack they could not thumbtack	I could not be thumbtacking you could not be thumbtacking he could not be thumbtacking we could not be thumbtacking you could not be thumbtacking they could not be thumbtacking
Perfeito	Perfeito com V-ing
I could not have thumbtacked you could not have thumbtacked he could not have thumbtacked we could not have thumbtacked you could not have thumbtacked they could not have thumbtacked	I could not have been thumbtacking you could not have been thumbtacking he could not have been thumbtacking we could not have been thumbtacking you could not have been thumbtacking they could not have been thumbtacking

Forma interrogativa

Forma simple	Forma com V-ing
could I thumbtack? could you thumbtack? could he thumbtack? could we thumbtack? could you thumbtack? could they thumbtack?	could I be thumbtacking? could you be thumbtacking? could he be thumbtacking? could we be thumbtacking? could you be thumbtacking? could they be thumbtacking?
Perfeito	Perfeito com V-ing
could I have thumbtacked? could you have thumbtacked? could he have thumbtacked? could we have thumbtacked? could you have thumbtacked? could they have thumbtacked?	could I have been thumbtacking? could you have been thumbtacking? could he have been thumbtacking? could we have been thumbtacking? could you have been thumbtacking? could they have been thumbtacking?

Forma interro-Negação

Forma simple	Forma com V-ing
could I not thumbtack? could you not thumbtack? could he not thumbtack? could we not thumbtack? could you not thumbtack? could they not thumbtack?	could I not be thumbtacking? could you not be thumbtacking? could he not be thumbtacking? could we not be thumbtacking? could you not be thumbtacking? could they not be thumbtacking?
Perfeito	Perfeito com V-ing
could I not have thumbtacked? could you not have thumbtacked? could he not have thumbtacked? could we not have thumbtacked? could you not have thumbtacked? could they not have thumbtacked?	could I not have been thumbtacking? could you not have been thumbtacking? could he not have been thumbtacking? could we not have been thumbtacking? could you not have been thumbtacking? could they not have been thumbtacking?