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 couldn't thumbtack you couldn't thumbtack he couldn't thumbtack we couldn't thumbtack you couldn't thumbtack they couldn't thumbtack	I couldn't be thumbtacking you couldn't be thumbtacking he couldn't be thumbtacking we couldn't be thumbtacking you couldn't be thumbtacking they couldn't be thumbtacking
Perfeito	Perfeito com V-ing
I couldn't have thumbtacked you couldn't have thumbtacked he couldn't have thumbtacked we couldn't have thumbtacked you couldn't have thumbtacked they couldn't have thumbtacked	I couldn't have been thumbtacking you couldn't have been thumbtacking he couldn't have been thumbtacking we couldn't have been thumbtacking you couldn't have been thumbtacking they couldn't 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
couldn't I thumbtack? couldn't you thumbtack? couldn't he thumbtack? couldn't we thumbtack? couldn't you thumbtack? couldn't they thumbtack?	couldn't I be thumbtacking? couldn't you be thumbtacking? couldn't he be thumbtacking? couldn't we be thumbtacking? couldn't you be thumbtacking? couldn't they be thumbtacking?
Perfeito	Perfeito com V-ing
couldn't I have thumbtacked? couldn't you have thumbtacked? couldn't he have thumbtacked? couldn't we have thumbtacked? couldn't you have thumbtacked? couldn't they have thumbtacked?	couldn't I have been thumbtacking? couldn't you have been thumbtacking? couldn't he have been thumbtacking? couldn't we have been thumbtacking? couldn't you have been thumbtacking? couldn't they have been thumbtacking?