English verb conjugation
MUST YAP YAP

Regular verb: yap yap - yap yaped - yap yaped

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I must yap yap you must yap yap he must yap yap we must yap yap you must yap yap they must yap yap	I must be yap yaping you must be yap yaping he must be yap yaping we must be yap yaping you must be yap yaping they must be yap yaping
Perfect	V-ing perfect
I must have yap yaped you must have yap yaped he must have yap yaped we must have yap yaped you must have yap yaped they must have yap yaped	I must have been yap yaping you must have been yap yaping he must have been yap yaping we must have been yap yaping you must have been yap yaping they must have been yap yaping

Negation

Simple form	V-ing form
I mustn't yap yap you mustn't yap yap he mustn't yap yap we mustn't yap yap you mustn't yap yap they mustn't yap yap	I mustn't be yap yaping you mustn't be yap yaping he mustn't be yap yaping we mustn't be yap yaping you mustn't be yap yaping they mustn't be yap yaping
Perfect	V-ing perfect
I mustn't have yap yaped you mustn't have yap yaped he mustn't have yap yaped we mustn't have yap yaped you mustn't have yap yaped they mustn't have yap yaped	I mustn't have been yap yaping you mustn't have been yap yaping he mustn't have been yap yaping we mustn't have been yap yaping you mustn't have been yap yaping they mustn't have been yap yaping

Interrogative form

Simple form	V-ing form
must I yap yap? must you yap yap? must he yap yap? must we yap yap? must you yap yap? must they yap yap?	must I be yap yaping? must you be yap yaping? must he be yap yaping? must we be yap yaping? must you be yap yaping? must they be yap yaping?
Perfect	V-ing perfect
must I have yap yaped? must you have yap yaped? must he have yap yaped? must we have yap yaped? must you have yap yaped? must they have yap yaped?	must I have been yap yaping? must you have been yap yaping? must he have been yap yaping? must we have been yap yaping? must you have been yap yaping? must they have been yap yaping?

Interro-negative form

Simple form	V-ing form
mustn't I yap yap? mustn't you yap yap? mustn't he yap yap? mustn't we yap yap? mustn't you yap yap? mustn't they yap yap?	mustn't I be yap yaping? mustn't you be yap yaping? mustn't he be yap yaping? mustn't we be yap yaping? mustn't you be yap yaping? mustn't they be yap yaping?
Perfect	V-ing perfect
mustn't I have yap yaped? mustn't you have yap yaped? mustn't he have yap yaped? mustn't we have yap yaped? mustn't you have yap yaped? mustn't they have yap yaped?	mustn't I have been yap yaping? mustn't you have been yap yaping? mustn't he have been yap yaping? mustn't we have been yap yaping? mustn't you have been yap yaping? mustn't they have been yap yaping?