English verb conjugation
MUST DEMONSTRATE

Regular verb: demonstrate - demonstrated - demonstrated

Affirmation

Simple form	V-ing form
I must demonstrate you must demonstrate she must demonstrate we must demonstrate you must demonstrate they must demonstrate	I must be demonstrating you must be demonstrating she 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 she 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 she 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 mustn't demonstrate you mustn't demonstrate she mustn't demonstrate we mustn't demonstrate you mustn't demonstrate they mustn't demonstrate	I mustn't be demonstrating you mustn't be demonstrating she mustn't be demonstrating we mustn't be demonstrating you mustn't be demonstrating they mustn't be demonstrating
Perfect	V-ing perfect
I mustn't have demonstrated you mustn't have demonstrated she mustn't have demonstrated we mustn't have demonstrated you mustn't have demonstrated they mustn't have demonstrated	I mustn't have been demonstrating you mustn't have been demonstrating she mustn't have been demonstrating we mustn't have been demonstrating you mustn't have been demonstrating they mustn't have been demonstrating

Interrogative form

Simple form	V-ing form
must I demonstrate? must you demonstrate? must she demonstrate? must we demonstrate? must you demonstrate? must they demonstrate?	must I be demonstrating? must you be demonstrating? must she 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 she 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 she 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
mustn't I demonstrate? mustn't you demonstrate? mustn't she demonstrate? mustn't we demonstrate? mustn't you demonstrate? mustn't they demonstrate?	mustn't I be demonstrating? mustn't you be demonstrating? mustn't she be demonstrating? mustn't we be demonstrating? mustn't you be demonstrating? mustn't they be demonstrating?
Perfect	V-ing perfect
mustn't I have demonstrated? mustn't you have demonstrated? mustn't she have demonstrated? mustn't we have demonstrated? mustn't you have demonstrated? mustn't they have demonstrated?	mustn't I have been demonstrating? mustn't you have been demonstrating? mustn't she have been demonstrating? mustn't we have been demonstrating? mustn't you have been demonstrating? mustn't they have been demonstrating?