English verb conjugation
MUST DEMONSTRATE

Regular verb: demonstrate - demonstrated - demonstrated

Affirmation

Simple form	V-ing form
I must demonstrate you must demonstrate he must demonstrate we must demonstrate you must demonstrate they must demonstrate	I must be demonstrating you must be demonstrating he must be demonstrating we must be demonstrating you must be demonstrating they must be demonstrating
Perfect	V-ing perfect
I must have demonstrated you must have demonstrated he must have demonstrated we must have demonstrated you must have demonstrated they must have demonstrated	I must have been demonstrating you must have been demonstrating he must have been demonstrating we must have been demonstrating you must have been demonstrating they must have been demonstrating

Negation

Simple form	V-ing form
I must not demonstrate you must not demonstrate he must not demonstrate we must not demonstrate you must not demonstrate they must not demonstrate	I must not be demonstrating you must not be demonstrating he must not be demonstrating we must not be demonstrating you must not be demonstrating they must not be demonstrating
Perfect	V-ing perfect
I must not have demonstrated you must not have demonstrated he must not have demonstrated we must not have demonstrated you must not have demonstrated they must not have demonstrated	I must not have been demonstrating you must not have been demonstrating he must not have been demonstrating we must not have been demonstrating you must not have been demonstrating they must not have been demonstrating

Interrogative form

Simple form	V-ing form
must I demonstrate? must you demonstrate? must he demonstrate? must we demonstrate? must you demonstrate? must they demonstrate?	must I be demonstrating? must you be demonstrating? must he be demonstrating? must we be demonstrating? must you be demonstrating? must they be demonstrating?
Perfect	V-ing perfect
must I have demonstrated? must you have demonstrated? must he have demonstrated? must we have demonstrated? must you have demonstrated? must they have demonstrated?	must I have been demonstrating? must you have been demonstrating? must he have been demonstrating? must we have been demonstrating? must you have been demonstrating? must they have been demonstrating?

Interro-negative form

Simple form	V-ing form
must I not demonstrate? must you not demonstrate? must he not demonstrate? must we not demonstrate? must you not demonstrate? must they not demonstrate?	must I not be demonstrating? must you not be demonstrating? must he not be demonstrating? must we not be demonstrating? must you not be demonstrating? must they not be demonstrating?
Perfect	V-ing perfect
must I not have demonstrated? must you not have demonstrated? must he not have demonstrated? must we not have demonstrated? must you not have demonstrated? must they not have demonstrated?	must I not have been demonstrating? must you not have been demonstrating? must he not have been demonstrating? must we not have been demonstrating? must you not have been demonstrating? must they not have been demonstrating?