English verb conjugation
MUST YEARN

Regular verb: yearn - yearned - yearned

Affirmation

Simple form	V-ing form
I must yearn you must yearn he must yearn we must yearn you must yearn they must yearn	I must be yearning you must be yearning he must be yearning we must be yearning you must be yearning they must be yearning
Perfect	V-ing perfect
I must have yearned you must have yearned he must have yearned we must have yearned you must have yearned they must have yearned	I must have been yearning you must have been yearning he must have been yearning we must have been yearning you must have been yearning they must have been yearning

Negation

Simple form	V-ing form
I mustn't yearn you mustn't yearn he mustn't yearn we mustn't yearn you mustn't yearn they mustn't yearn	I mustn't be yearning you mustn't be yearning he mustn't be yearning we mustn't be yearning you mustn't be yearning they mustn't be yearning
Perfect	V-ing perfect
I mustn't have yearned you mustn't have yearned he mustn't have yearned we mustn't have yearned you mustn't have yearned they mustn't have yearned	I mustn't have been yearning you mustn't have been yearning he mustn't have been yearning we mustn't have been yearning you mustn't have been yearning they mustn't have been yearning

Interrogative form

Simple form	V-ing form
must I yearn? must you yearn? must he yearn? must we yearn? must you yearn? must they yearn?	must I be yearning? must you be yearning? must he be yearning? must we be yearning? must you be yearning? must they be yearning?
Perfect	V-ing perfect
must I have yearned? must you have yearned? must he have yearned? must we have yearned? must you have yearned? must they have yearned?	must I have been yearning? must you have been yearning? must he have been yearning? must we have been yearning? must you have been yearning? must they have been yearning?

Interro-negative form

Simple form	V-ing form
mustn't I yearn? mustn't you yearn? mustn't he yearn? mustn't we yearn? mustn't you yearn? mustn't they yearn?	mustn't I be yearning? mustn't you be yearning? mustn't he be yearning? mustn't we be yearning? mustn't you be yearning? mustn't they be yearning?
Perfect	V-ing perfect
mustn't I have yearned? mustn't you have yearned? mustn't he have yearned? mustn't we have yearned? mustn't you have yearned? mustn't they have yearned?	mustn't I have been yearning? mustn't you have been yearning? mustn't he have been yearning? mustn't we have been yearning? mustn't you have been yearning? mustn't they have been yearning?