English verb conjugation
MUST BAR

Regular verb: bar - barred - barred

Affirmation

Simple form	V-ing form
I must bar you must bar he must bar we must bar you must bar they must bar	I must be barring you must be barring he must be barring we must be barring you must be barring they must be barring
Perfect	V-ing perfect
I must have barred you must have barred he must have barred we must have barred you must have barred they must have barred	I must have been barring you must have been barring he must have been barring we must have been barring you must have been barring they must have been barring

Negation

Simple form	V-ing form
I must not bar you must not bar he must not bar we must not bar you must not bar they must not bar	I must not be barring you must not be barring he must not be barring we must not be barring you must not be barring they must not be barring
Perfect	V-ing perfect
I must not have barred you must not have barred he must not have barred we must not have barred you must not have barred they must not have barred	I must not have been barring you must not have been barring he must not have been barring we must not have been barring you must not have been barring they must not have been barring

Interrogative form

Simple form	V-ing form
must I bar? must you bar? must he bar? must we bar? must you bar? must they bar?	must I be barring? must you be barring? must he be barring? must we be barring? must you be barring? must they be barring?
Perfect	V-ing perfect
must I have barred? must you have barred? must he have barred? must we have barred? must you have barred? must they have barred?	must I have been barring? must you have been barring? must he have been barring? must we have been barring? must you have been barring? must they have been barring?

Interro-negative form

Simple form	V-ing form
must I not bar? must you not bar? must he not bar? must we not bar? must you not bar? must they not bar?	must I not be barring? must you not be barring? must he not be barring? must we not be barring? must you not be barring? must they not be barring?
Perfect	V-ing perfect
must I not have barred? must you not have barred? must he not have barred? must we not have barred? must you not have barred? must they not have barred?	must I not have been barring? must you not have been barring? must he not have been barring? must we not have been barring? must you not have been barring? must they not have been barring?