English verb conjugation
MUST YEN

Regular verb: yen - yenned - yenned

Affirmation

Simple form	V-ing form
I must yen you must yen he must yen we must yen you must yen they must yen	I must be yenning you must be yenning he must be yenning we must be yenning you must be yenning they must be yenning
Perfect	V-ing perfect
I must have yenned you must have yenned he must have yenned we must have yenned you must have yenned they must have yenned	I must have been yenning you must have been yenning he must have been yenning we must have been yenning you must have been yenning they must have been yenning

Negation

Simple form	V-ing form
I mustn't yen you mustn't yen he mustn't yen we mustn't yen you mustn't yen they mustn't yen	I mustn't be yenning you mustn't be yenning he mustn't be yenning we mustn't be yenning you mustn't be yenning they mustn't be yenning
Perfect	V-ing perfect
I mustn't have yenned you mustn't have yenned he mustn't have yenned we mustn't have yenned you mustn't have yenned they mustn't have yenned	I mustn't have been yenning you mustn't have been yenning he mustn't have been yenning we mustn't have been yenning you mustn't have been yenning they mustn't have been yenning

Interrogative form

Simple form	V-ing form
must I yen? must you yen? must he yen? must we yen? must you yen? must they yen?	must I be yenning? must you be yenning? must he be yenning? must we be yenning? must you be yenning? must they be yenning?
Perfect	V-ing perfect
must I have yenned? must you have yenned? must he have yenned? must we have yenned? must you have yenned? must they have yenned?	must I have been yenning? must you have been yenning? must he have been yenning? must we have been yenning? must you have been yenning? must they have been yenning?

Interro-negative form

Simple form	V-ing form
mustn't I yen? mustn't you yen? mustn't he yen? mustn't we yen? mustn't you yen? mustn't they yen?	mustn't I be yenning? mustn't you be yenning? mustn't he be yenning? mustn't we be yenning? mustn't you be yenning? mustn't they be yenning?
Perfect	V-ing perfect
mustn't I have yenned? mustn't you have yenned? mustn't he have yenned? mustn't we have yenned? mustn't you have yenned? mustn't they have yenned?	mustn't I have been yenning? mustn't you have been yenning? mustn't he have been yenning? mustn't we have been yenning? mustn't you have been yenning? mustn't they have been yenning?