English verb conjugation
CAN COO

Regular verb: coo - cooed - cooed

Affirmation

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

Interrogative form

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