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 mustn't yo-yo you mustn't yo-yo he mustn't yo-yo we mustn't yo-yo you mustn't yo-yo they mustn't yo-yo	I mustn't be yo-yoing you mustn't be yo-yoing he mustn't be yo-yoing we mustn't be yo-yoing you mustn't be yo-yoing they mustn't be yo-yoing
Perfect	V-ing perfect
I mustn't have yo-yoed you mustn't have yo-yoed he mustn't have yo-yoed we mustn't have yo-yoed you mustn't have yo-yoed they mustn't have yo-yoed	I mustn't have been yo-yoing you mustn't have been yo-yoing he mustn't have been yo-yoing we mustn't have been yo-yoing you mustn't have been yo-yoing they mustn't 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
mustn't I yo-yo? mustn't you yo-yo? mustn't he yo-yo? mustn't we yo-yo? mustn't you yo-yo? mustn't they yo-yo?	mustn't I be yo-yoing? mustn't you be yo-yoing? mustn't he be yo-yoing? mustn't we be yo-yoing? mustn't you be yo-yoing? mustn't they be yo-yoing?
Perfect	V-ing perfect
mustn't I have yo-yoed? mustn't you have yo-yoed? mustn't he have yo-yoed? mustn't we have yo-yoed? mustn't you have yo-yoed? mustn't they have yo-yoed?	mustn't I have been yo-yoing? mustn't you have been yo-yoing? mustn't he have been yo-yoing? mustn't we have been yo-yoing? mustn't you have been yo-yoing? mustn't they have been yo-yoing?