English verb conjugation
COULD COO

Regular verb: coo - cooed - cooed

Affirmation

Simple form	V-ing form
I could coo you could coo she could coo we could coo you could coo they could coo	I could be cooing you could be cooing she could be cooing we could be cooing you could be cooing they could be cooing
Perfect	V-ing perfect
I could have cooed you could have cooed she could have cooed we could have cooed you could have cooed they could have cooed	I could have been cooing you could have been cooing she could have been cooing we could have been cooing you could have been cooing they could have been cooing

Negation

Simple form	V-ing form
I could not coo you could not coo she could not coo we could not coo you could not coo they could not coo	I could not be cooing you could not be cooing she could not be cooing we could not be cooing you could not be cooing they could not be cooing
Perfect	V-ing perfect
I could not have cooed you could not have cooed she could not have cooed we could not have cooed you could not have cooed they could not have cooed	I could not have been cooing you could not have been cooing she could not have been cooing we could not have been cooing you could not have been cooing they could not have been cooing

Interrogative form

Simple form	V-ing form
could I coo? could you coo? could she coo? could we coo? could you coo? could they coo?	could I be cooing? could you be cooing? could she be cooing? could we be cooing? could you be cooing? could they be cooing?
Perfect	V-ing perfect
could I have cooed? could you have cooed? could she have cooed? could we have cooed? could you have cooed? could they have cooed?	could I have been cooing? could you have been cooing? could she have been cooing? could we have been cooing? could you have been cooing? could they have been cooing?

Interro-negative form

Simple form	V-ing form
could I not coo? could you not coo? could she not coo? could we not coo? could you not coo? could they not coo?	could I not be cooing? could you not be cooing? could she not be cooing? could we not be cooing? could you not be cooing? could they not be cooing?
Perfect	V-ing perfect
could I not have cooed? could you not have cooed? could she not have cooed? could we not have cooed? could you not have cooed? could they not have cooed?	could I not have been cooing? could you not have been cooing? could she not have been cooing? could we not have been cooing? could you not have been cooing? could they not have been cooing?