English verb conjugation
MUST YO-YO

Regular verb: yo-yo - yo-yoed - yo-yoed

Affirmation

Simple form	V-ing form
I must yo-yo you must yo-yo he must yo-yo we must yo-yo you must yo-yo they must yo-yo	I must be yo-yoing you must be yo-yoing he must be yo-yoing we must be yo-yoing you must be yo-yoing they must be yo-yoing
Perfect	V-ing perfect
I must have yo-yoed you must have yo-yoed he must have yo-yoed we must have yo-yoed you must have yo-yoed they must have yo-yoed	I must have been yo-yoing you must have been yo-yoing he must have been yo-yoing we must have been yo-yoing you must have been yo-yoing they must have been yo-yoing

Negation

Simple form	V-ing form
I must not yo-yo you must not yo-yo he must not yo-yo we must not yo-yo you must not yo-yo they must not yo-yo	I must not be yo-yoing you must not be yo-yoing he must not be yo-yoing we must not be yo-yoing you must not be yo-yoing they must not be yo-yoing
Perfect	V-ing perfect
I must not have yo-yoed you must not have yo-yoed he must not have yo-yoed we must not have yo-yoed you must not have yo-yoed they must not have yo-yoed	I must not have been yo-yoing you must not have been yo-yoing he must not have been yo-yoing we must not have been yo-yoing you must not have been yo-yoing they must not have been yo-yoing

Interrogative form

Simple form	V-ing form
must I yo-yo? must you yo-yo? must he yo-yo? must we yo-yo? must you yo-yo? must they yo-yo?	must I be yo-yoing? must you be yo-yoing? must he be yo-yoing? must we be yo-yoing? must you be yo-yoing? must they be yo-yoing?
Perfect	V-ing perfect
must I have yo-yoed? must you have yo-yoed? must he have yo-yoed? must we have yo-yoed? must you have yo-yoed? must they have yo-yoed?	must I have been yo-yoing? must you have been yo-yoing? must he have been yo-yoing? must we have been yo-yoing? must you have been yo-yoing? must they have been yo-yoing?

Interro-negative form

Simple form	V-ing form
must I not yo-yo? must you not yo-yo? must he not yo-yo? must we not yo-yo? must you not yo-yo? must they not yo-yo?	must I not be yo-yoing? must you not be yo-yoing? must he not be yo-yoing? must we not be yo-yoing? must you not be yo-yoing? must they not be yo-yoing?
Perfect	V-ing perfect
must I not have yo-yoed? must you not have yo-yoed? must he not have yo-yoed? must we not have yo-yoed? must you not have yo-yoed? must they not have yo-yoed?	must I not have been yo-yoing? must you not have been yo-yoing? must he not have been yo-yoing? must we not have been yo-yoing? must you not have been yo-yoing? must they not have been yo-yoing?