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 must not illustrate you must not illustrate he must not illustrate we must not illustrate you must not illustrate they must not illustrate	I must not be illustrating you must not be illustrating he must not be illustrating we must not be illustrating you must not be illustrating they must not be illustrating
Perfect	V-ing perfect
I must not have illustrated you must not have illustrated he must not have illustrated we must not have illustrated you must not have illustrated they must not have illustrated	I must not have been illustrating you must not have been illustrating he must not have been illustrating we must not have been illustrating you must not have been illustrating they must not 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
must I not illustrate? must you not illustrate? must he not illustrate? must we not illustrate? must you not illustrate? must they not illustrate?	must I not be illustrating? must you not be illustrating? must he not be illustrating? must we not be illustrating? must you not be illustrating? must they not be illustrating?
Perfect	V-ing perfect
must I not have illustrated? must you not have illustrated? must he not have illustrated? must we not have illustrated? must you not have illustrated? must they not have illustrated?	must I not have been illustrating? must you not have been illustrating? must he not have been illustrating? must we not have been illustrating? must you not have been illustrating? must they not have been illustrating?