English verb conjugation
MUST DOWN

Regular verb: down - downed - downed

Affirmation

Simple form	V-ing form
I must down you must down he must down we must down you must down they must down	I must be downing you must be downing he must be downing we must be downing you must be downing they must be downing
Perfect	V-ing perfect
I must have downed you must have downed he must have downed we must have downed you must have downed they must have downed	I must have been downing you must have been downing he must have been downing we must have been downing you must have been downing they must have been downing

Negation

Simple form	V-ing form
I must not down you must not down he must not down we must not down you must not down they must not down	I must not be downing you must not be downing he must not be downing we must not be downing you must not be downing they must not be downing
Perfect	V-ing perfect
I must not have downed you must not have downed he must not have downed we must not have downed you must not have downed they must not have downed	I must not have been downing you must not have been downing he must not have been downing we must not have been downing you must not have been downing they must not have been downing

Interrogative form

Simple form	V-ing form
must I down? must you down? must he down? must we down? must you down? must they down?	must I be downing? must you be downing? must he be downing? must we be downing? must you be downing? must they be downing?
Perfect	V-ing perfect
must I have downed? must you have downed? must he have downed? must we have downed? must you have downed? must they have downed?	must I have been downing? must you have been downing? must he have been downing? must we have been downing? must you have been downing? must they have been downing?

Interro-negative form

Simple form	V-ing form
must I not down? must you not down? must he not down? must we not down? must you not down? must they not down?	must I not be downing? must you not be downing? must he not be downing? must we not be downing? must you not be downing? must they not be downing?
Perfect	V-ing perfect
must I not have downed? must you not have downed? must he not have downed? must we not have downed? must you not have downed? must they not have downed?	must I not have been downing? must you not have been downing? must he not have been downing? must we not have been downing? must you not have been downing? must they not have been downing?