must enlighten
Regular verb: enlighten - enlightened- enlightened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must enlighten
you must enlighten
she must enlighten
we must enlighten
you must enlighten
they must enlighten 	I must be enlightening
you must be enlightening
she must be enlightening
we must be enlightening
you must be enlightening
they must be enlightening	I must have enlightened
you must have enlightened
she 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
she 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 must not enlighten
you must not enlighten
she must not enlighten
we must not enlighten
you must not enlighten
they must not enlighten 	I must not be enlightening
you must not be enlightening
she must not be enlightening
we must not be enlightening
you must not be enlightening
they must not be enlightening	I must not have enlightened
you must not have enlightened
she must not have enlightened
we must not have enlightened
you must not have enlightened
they must not have enlightened	I must not have been enlightening
you must not have been enlightening
she must not have been enlightening
we must not have been enlightening
you must not have been enlightening
they must not have been enlightening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I enlighten?
must you enlighten?
must she enlighten?
must we enlighten?
must you enlighten?
must they enlighten? 	must I be enlightening?
must you be enlightening?
must she be enlightening?
must we be enlightening?
must you be enlightening?
must they be enlightening? 	must I have enlightened?
must you have enlightened?
must she 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 she 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 	
must I not enlighten?
must you not enlighten?
must she not enlighten?
must we not enlighten?
must you not enlighten?
must they not enlighten? 	must I not be enlightening?
must you not be enlightening?
must she not be enlightening?
must we not be enlightening?
must you not be enlightening?
must they not be enlightening? 	must I not have enlightened?
must you not have enlightened?
must she not have enlightened?
must we not have enlightened?
must you not have enlightened?
must they not have enlightened? 	must I not have been enlightening?
must you not have been enlightening?
must she not have been enlightening?
must we not have been enlightening?
must you not have been enlightening?
must they not have been enlightening?