must enlighten
Regular verb: enlighten - enlightened- enlightened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must enlighten
you must enlighten
he must enlighten
we must enlighten
you must enlighten
they must enlighten 	I must be enlightening
you must be enlightening
he must be enlightening
we must be enlightening
you must be enlightening
they must be enlightening	I must have enlightened
you must have enlightened
he must have enlightened
we must have enlightened
you must have enlightened
they must have enlightened	I must have been enlightening
you must have been enlightening
he must have been enlightening
we must have been enlightening
you must have been enlightening
they must have been enlightening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't enlighten
you mustn't enlighten
he mustn't enlighten
we mustn't enlighten
you mustn't enlighten
they mustn't enlighten 	I mustn't be enlightening
you mustn't be enlightening
he mustn't be enlightening
we mustn't be enlightening
you mustn't be enlightening
they mustn't be enlightening	I mustn't have enlightened
you mustn't have enlightened
he mustn't have enlightened
we mustn't have enlightened
you mustn't have enlightened
they mustn't have enlightened	I mustn't have been enlightening
you mustn't have been enlightening
he mustn't have been enlightening
we mustn't have been enlightening
you mustn't have been enlightening
they mustn't have been enlightening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I enlighten?
must you enlighten?
must he enlighten?
must we enlighten?
must you enlighten?
must they enlighten? 	must I be enlightening?
must you be enlightening?
must he be enlightening?
must we be enlightening?
must you be enlightening?
must they be enlightening? 	must I have enlightened?
must you have enlightened?
must he have enlightened?
must we have enlightened?
must you have enlightened?
must they have enlightened? 	must I have been enlightening?
must you have been enlightening?
must he have been enlightening?
must we have been enlightening?
must you have been enlightening?
must they have been enlightening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I enlighten?
mustn't you enlighten?
mustn't he enlighten?
mustn't we enlighten?
mustn't you enlighten?
mustn't they enlighten? 	mustn't I be enlightening?
mustn't you be enlightening?
mustn't he be enlightening?
mustn't we be enlightening?
mustn't you be enlightening?
mustn't they be enlightening? 	mustn't I have enlightened?
mustn't you have enlightened?
mustn't he have enlightened?
mustn't we have enlightened?
mustn't you have enlightened?
mustn't they have enlightened? 	mustn't I have been enlightening?
mustn't you have been enlightening?
mustn't he have been enlightening?
mustn't we have been enlightening?
mustn't you have been enlightening?
mustn't they have been enlightening?