Conjugação do verbo inglês
COULD EXTRACT

Verbo regular: extract - extracted - extracted

Afirmação

Forma simple	Forma com V-ing
I could extract you could extract he could extract we could extract you could extract they could extract	I could be extracting you could be extracting he could be extracting we could be extracting you could be extracting they could be extracting
Perfeito	Perfeito com V-ing
I could have extracted you could have extracted he could have extracted we could have extracted you could have extracted they could have extracted	I could have been extracting you could have been extracting he could have been extracting we could have been extracting you could have been extracting they could have been extracting

Negação

Forma simple	Forma com V-ing
I couldn't extract you couldn't extract he couldn't extract we couldn't extract you couldn't extract they couldn't extract	I couldn't be extracting you couldn't be extracting he couldn't be extracting we couldn't be extracting you couldn't be extracting they couldn't be extracting
Perfeito	Perfeito com V-ing
I couldn't have extracted you couldn't have extracted he couldn't have extracted we couldn't have extracted you couldn't have extracted they couldn't have extracted	I couldn't have been extracting you couldn't have been extracting he couldn't have been extracting we couldn't have been extracting you couldn't have been extracting they couldn't have been extracting

Forma interrogativa

Forma simple	Forma com V-ing
could I extract? could you extract? could he extract? could we extract? could you extract? could they extract?	could I be extracting? could you be extracting? could he be extracting? could we be extracting? could you be extracting? could they be extracting?
Perfeito	Perfeito com V-ing
could I have extracted? could you have extracted? could he have extracted? could we have extracted? could you have extracted? could they have extracted?	could I have been extracting? could you have been extracting? could he have been extracting? could we have been extracting? could you have been extracting? could they have been extracting?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I extract? couldn't you extract? couldn't he extract? couldn't we extract? couldn't you extract? couldn't they extract?	couldn't I be extracting? couldn't you be extracting? couldn't he be extracting? couldn't we be extracting? couldn't you be extracting? couldn't they be extracting?
Perfeito	Perfeito com V-ing
couldn't I have extracted? couldn't you have extracted? couldn't he have extracted? couldn't we have extracted? couldn't you have extracted? couldn't they have extracted?	couldn't I have been extracting? couldn't you have been extracting? couldn't he have been extracting? couldn't we have been extracting? couldn't you have been extracting? couldn't they have been extracting?