English verb conjugation
MUST YES

Regular verb: yes - yesed - yesed

Affirmation

Simple form	V-ing form
I must yes you must yes she must yes we must yes you must yes they must yes	I must be yesing you must be yesing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she yes? must we yes? must you yes? must they yes?	must I be yesing? must you be yesing? must she 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 she 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 she 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 she 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 she 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 she 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 she have been yesing? mustn't we have been yesing? mustn't you have been yesing? mustn't they have been yesing?