English verb conjugation
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Regular verb: illustrate - illustrated - illustrated

Affirmation

Simple form	V-ing form
I must illustrate you must illustrate he must illustrate we must illustrate you must illustrate they must illustrate	I must be illustrating you must be illustrating he must be illustrating we must be illustrating you must be illustrating they must be illustrating
Perfect	V-ing perfect
I must have illustrated you must have illustrated he must have illustrated we must have illustrated you must have illustrated they must have illustrated	I must have been illustrating you must have been illustrating he must have been illustrating we must have been illustrating you must have been illustrating they must have been illustrating

Negation

Simple form	V-ing form
I mustn't illustrate you mustn't illustrate he mustn't illustrate we mustn't illustrate you mustn't illustrate they mustn't illustrate	I mustn't be illustrating you mustn't be illustrating he mustn't be illustrating we mustn't be illustrating you mustn't be illustrating they mustn't be illustrating
Perfect	V-ing perfect
I mustn't have illustrated you mustn't have illustrated he mustn't have illustrated we mustn't have illustrated you mustn't have illustrated they mustn't have illustrated	I mustn't have been illustrating you mustn't have been illustrating he mustn't have been illustrating we mustn't have been illustrating you mustn't have been illustrating they mustn't have been illustrating

Interrogative form

Simple form	V-ing form
must I illustrate? must you illustrate? must he illustrate? must we illustrate? must you illustrate? must they illustrate?	must I be illustrating? must you be illustrating? must he be illustrating? must we be illustrating? must you be illustrating? must they be illustrating?
Perfect	V-ing perfect
must I have illustrated? must you have illustrated? must he have illustrated? must we have illustrated? must you have illustrated? must they have illustrated?	must I have been illustrating? must you have been illustrating? must he have been illustrating? must we have been illustrating? must you have been illustrating? must they have been illustrating?

Interro-negative form

Simple form	V-ing form
mustn't I illustrate? mustn't you illustrate? mustn't he illustrate? mustn't we illustrate? mustn't you illustrate? mustn't they illustrate?	mustn't I be illustrating? mustn't you be illustrating? mustn't he be illustrating? mustn't we be illustrating? mustn't you be illustrating? mustn't they be illustrating?
Perfect	V-ing perfect
mustn't I have illustrated? mustn't you have illustrated? mustn't he have illustrated? mustn't we have illustrated? mustn't you have illustrated? mustn't they have illustrated?	mustn't I have been illustrating? mustn't you have been illustrating? mustn't he have been illustrating? mustn't we have been illustrating? mustn't you have been illustrating? mustn't they have been illustrating?