English verb conjugation
CAN COO

Regular verb: coo - cooed - cooed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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