I can coo you can coo he can coo we can coo you can coo they can coo
V-ing form
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
I can have cooed you can have cooed he can have cooed we can have cooed you can have cooed they can have cooed
V-ing perfect
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
I can't coo you can't coo he can't coo we can't coo you can't coo they can't coo
V-ing form
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
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
V-ing perfect
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
can I coo? can you coo? can he coo? can we coo? can you coo? can they coo?
V-ing form
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
can I have cooed? can you have cooed? can he have cooed? can we have cooed? can you have cooed? can they have cooed?
V-ing perfect
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
can't I coo? can't you coo? can't he coo? can't we coo? can't you coo? can't they coo?
V-ing form
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
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?
V-ing perfect
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?