Conjugación del verbo inglés
COULD EXTRACT

Verbo regular: extract - extracted - extracted

Afirmación

Forma simple	Forma con V-ing
I could extract you could extract she could extract we could extract you could extract they could extract	I could be extracting you could be extracting she could be extracting we could be extracting you could be extracting they could be extracting
Perfecto	Perfecto con V-ing
I could have extracted you could have extracted she 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 she could have been extracting we could have been extracting you could have been extracting they could have been extracting

Negación

Forma simple	Forma con V-ing
I couldn't extract you couldn't extract she 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 she couldn't be extracting we couldn't be extracting you couldn't be extracting they couldn't be extracting
Perfecto	Perfecto con V-ing
I couldn't have extracted you couldn't have extracted she 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 she 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 con V-ing
could I extract? could you extract? could she extract? could we extract? could you extract? could they extract?	could I be extracting? could you be extracting? could she be extracting? could we be extracting? could you be extracting? could they be extracting?
Perfecto	Perfecto con V-ing
could I have extracted? could you have extracted? could she 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 she have been extracting? could we have been extracting? could you have been extracting? could they have been extracting?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I extract? couldn't you extract? couldn't she 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 she be extracting? couldn't we be extracting? couldn't you be extracting? couldn't they be extracting?
Perfecto	Perfecto con V-ing
couldn't I have extracted? couldn't you have extracted? couldn't she 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 she have been extracting? couldn't we have been extracting? couldn't you have been extracting? couldn't they have been extracting?