English verb conjugation
MUST YARN

Regular verb: yarn - yarned - yarned

Affirmation

Simple form	V-ing form
I must yarn you must yarn she must yarn we must yarn you must yarn they must yarn	I must be yarning you must be yarning she must be yarning we must be yarning you must be yarning they must be yarning
Perfect	V-ing perfect
I must have yarned you must have yarned she must have yarned we must have yarned you must have yarned they must have yarned	I must have been yarning you must have been yarning she must have been yarning we must have been yarning you must have been yarning they must have been yarning

Negation

Simple form	V-ing form
I must not yarn you must not yarn she must not yarn we must not yarn you must not yarn they must not yarn	I must not be yarning you must not be yarning she must not be yarning we must not be yarning you must not be yarning they must not be yarning
Perfect	V-ing perfect
I must not have yarned you must not have yarned she must not have yarned we must not have yarned you must not have yarned they must not have yarned	I must not have been yarning you must not have been yarning she must not have been yarning we must not have been yarning you must not have been yarning they must not have been yarning

Interrogative form

Simple form	V-ing form
must I yarn? must you yarn? must she yarn? must we yarn? must you yarn? must they yarn?	must I be yarning? must you be yarning? must she be yarning? must we be yarning? must you be yarning? must they be yarning?
Perfect	V-ing perfect
must I have yarned? must you have yarned? must she have yarned? must we have yarned? must you have yarned? must they have yarned?	must I have been yarning? must you have been yarning? must she have been yarning? must we have been yarning? must you have been yarning? must they have been yarning?

Interro-negative form

Simple form	V-ing form
must I not yarn? must you not yarn? must she not yarn? must we not yarn? must you not yarn? must they not yarn?	must I not be yarning? must you not be yarning? must she not be yarning? must we not be yarning? must you not be yarning? must they not be yarning?
Perfect	V-ing perfect
must I not have yarned? must you not have yarned? must she not have yarned? must we not have yarned? must you not have yarned? must they not have yarned?	must I not have been yarning? must you not have been yarning? must she not have been yarning? must we not have been yarning? must you not have been yarning? must they not have been yarning?