English verb conjugation
COULD COO

Regular verb: coo - cooed - cooed

Affirmation

Simple form	V-ing form
I could coo you could coo he could coo we could coo you could coo they could coo	I could be cooing you could be cooing he 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 he 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 he 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 couldn't coo you couldn't coo he couldn't coo we couldn't coo you couldn't coo they couldn't coo	I couldn't be cooing you couldn't be cooing he couldn't be cooing we couldn't be cooing you couldn't be cooing they couldn't be cooing
Perfect	V-ing perfect
I couldn't have cooed you couldn't have cooed he couldn't have cooed we couldn't have cooed you couldn't have cooed they couldn't have cooed	I couldn't have been cooing you couldn't have been cooing he couldn't have been cooing we couldn't have been cooing you couldn't have been cooing they couldn't have been cooing

Interrogative form

Simple form	V-ing form
could I coo? could you coo? could he coo? could we coo? could you coo? could they coo?	could I be cooing? could you be cooing? could he 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 he 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 he 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
couldn't I coo? couldn't you coo? couldn't he coo? couldn't we coo? couldn't you coo? couldn't they coo?	couldn't I be cooing? couldn't you be cooing? couldn't he be cooing? couldn't we be cooing? couldn't you be cooing? couldn't they be cooing?
Perfect	V-ing perfect
couldn't I have cooed? couldn't you have cooed? couldn't he have cooed? couldn't we have cooed? couldn't you have cooed? couldn't they have cooed?	couldn't I have been cooing? couldn't you have been cooing? couldn't he have been cooing? couldn't we have been cooing? couldn't you have been cooing? couldn't they have been cooing?