English verb conjugation
MUST BARN

Regular verb: barn - barned - barned

Affirmation

Simple form	V-ing form
I must barn you must barn he must barn we must barn you must barn they must barn	I must be barning you must be barning he must be barning we must be barning you must be barning they must be barning
Perfect	V-ing perfect
I must have barned you must have barned he must have barned we must have barned you must have barned they must have barned	I must have been barning you must have been barning he must have been barning we must have been barning you must have been barning they must have been barning

Negation

Simple form	V-ing form
I must not barn you must not barn he must not barn we must not barn you must not barn they must not barn	I must not be barning you must not be barning he must not be barning we must not be barning you must not be barning they must not be barning
Perfect	V-ing perfect
I must not have barned you must not have barned he must not have barned we must not have barned you must not have barned they must not have barned	I must not have been barning you must not have been barning he must not have been barning we must not have been barning you must not have been barning they must not have been barning

Interrogative form

Simple form	V-ing form
must I barn? must you barn? must he barn? must we barn? must you barn? must they barn?	must I be barning? must you be barning? must he be barning? must we be barning? must you be barning? must they be barning?
Perfect	V-ing perfect
must I have barned? must you have barned? must he have barned? must we have barned? must you have barned? must they have barned?	must I have been barning? must you have been barning? must he have been barning? must we have been barning? must you have been barning? must they have been barning?

Interro-negative form

Simple form	V-ing form
must I not barn? must you not barn? must he not barn? must we not barn? must you not barn? must they not barn?	must I not be barning? must you not be barning? must he not be barning? must we not be barning? must you not be barning? must they not be barning?
Perfect	V-ing perfect
must I not have barned? must you not have barned? must he not have barned? must we not have barned? must you not have barned? must they not have barned?	must I not have been barning? must you not have been barning? must he not have been barning? must we not have been barning? must you not have been barning? must they not have been barning?