English verb conjugation
MUST YES

Regular verb: yes - yesed - yesed

Affirmation

Simple form	V-ing form
I must yes you must yes he must yes we must yes you must yes they must yes	I must be yesing you must be yesing he must be yesing we must be yesing you must be yesing they must be yesing
Perfect	V-ing perfect
I must have yesed you must have yesed he must have yesed we must have yesed you must have yesed they must have yesed	I must have been yesing you must have been yesing he must have been yesing we must have been yesing you must have been yesing they must have been yesing

Negation

Simple form	V-ing form
I mustn't yes you mustn't yes he mustn't yes we mustn't yes you mustn't yes they mustn't yes	I mustn't be yesing you mustn't be yesing he mustn't be yesing we mustn't be yesing you mustn't be yesing they mustn't be yesing
Perfect	V-ing perfect
I mustn't have yesed you mustn't have yesed he mustn't have yesed we mustn't have yesed you mustn't have yesed they mustn't have yesed	I mustn't have been yesing you mustn't have been yesing he mustn't have been yesing we mustn't have been yesing you mustn't have been yesing they mustn't have been yesing

Interrogative form

Simple form	V-ing form
must I yes? must you yes? must he yes? must we yes? must you yes? must they yes?	must I be yesing? must you be yesing? must he be yesing? must we be yesing? must you be yesing? must they be yesing?
Perfect	V-ing perfect
must I have yesed? must you have yesed? must he have yesed? must we have yesed? must you have yesed? must they have yesed?	must I have been yesing? must you have been yesing? must he have been yesing? must we have been yesing? must you have been yesing? must they have been yesing?

Interro-negative form

Simple form	V-ing form
mustn't I yes? mustn't you yes? mustn't he yes? mustn't we yes? mustn't you yes? mustn't they yes?	mustn't I be yesing? mustn't you be yesing? mustn't he be yesing? mustn't we be yesing? mustn't you be yesing? mustn't they be yesing?
Perfect	V-ing perfect
mustn't I have yesed? mustn't you have yesed? mustn't he have yesed? mustn't we have yesed? mustn't you have yesed? mustn't they have yesed?	mustn't I have been yesing? mustn't you have been yesing? mustn't he have been yesing? mustn't we have been yesing? mustn't you have been yesing? mustn't they have been yesing?