English verb conjugation
MUST CUCKOO

Regular verb: cuckoo - cuckooed - cuckooed

Affirmation

Simple form	V-ing form
I must cuckoo you must cuckoo he must cuckoo we must cuckoo you must cuckoo they must cuckoo	I must be cuckooing you must be cuckooing he must be cuckooing we must be cuckooing you must be cuckooing they must be cuckooing
Perfect	V-ing perfect
I must have cuckooed you must have cuckooed he must have cuckooed we must have cuckooed you must have cuckooed they must have cuckooed	I must have been cuckooing you must have been cuckooing he must have been cuckooing we must have been cuckooing you must have been cuckooing they must have been cuckooing

Negation

Simple form	V-ing form
I must not cuckoo you must not cuckoo he must not cuckoo we must not cuckoo you must not cuckoo they must not cuckoo	I must not be cuckooing you must not be cuckooing he must not be cuckooing we must not be cuckooing you must not be cuckooing they must not be cuckooing
Perfect	V-ing perfect
I must not have cuckooed you must not have cuckooed he must not have cuckooed we must not have cuckooed you must not have cuckooed they must not have cuckooed	I must not have been cuckooing you must not have been cuckooing he must not have been cuckooing we must not have been cuckooing you must not have been cuckooing they must not have been cuckooing

Interrogative form

Simple form	V-ing form
must I cuckoo? must you cuckoo? must he cuckoo? must we cuckoo? must you cuckoo? must they cuckoo?	must I be cuckooing? must you be cuckooing? must he be cuckooing? must we be cuckooing? must you be cuckooing? must they be cuckooing?
Perfect	V-ing perfect
must I have cuckooed? must you have cuckooed? must he have cuckooed? must we have cuckooed? must you have cuckooed? must they have cuckooed?	must I have been cuckooing? must you have been cuckooing? must he have been cuckooing? must we have been cuckooing? must you have been cuckooing? must they have been cuckooing?

Interro-negative form

Simple form	V-ing form
must I not cuckoo? must you not cuckoo? must he not cuckoo? must we not cuckoo? must you not cuckoo? must they not cuckoo?	must I not be cuckooing? must you not be cuckooing? must he not be cuckooing? must we not be cuckooing? must you not be cuckooing? must they not be cuckooing?
Perfect	V-ing perfect
must I not have cuckooed? must you not have cuckooed? must he not have cuckooed? must we not have cuckooed? must you not have cuckooed? must they not have cuckooed?	must I not have been cuckooing? must you not have been cuckooing? must he not have been cuckooing? must we not have been cuckooing? must you not have been cuckooing? must they not have been cuckooing?