English verb conjugation
MUST COO

Regular verb: coo - cooed - cooed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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