may brighten
Regular verb: brighten - brightened- brightened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may brighten
you may brighten
she may brighten
we may brighten
you may brighten
they may brighten 	I may be brightening
you may be brightening
she may be brightening
we may be brightening
you may be brightening
they may be brightening	I may have brightened
you may have brightened
she may have brightened
we may have brightened
you may have brightened
they may have brightened	I may have been brightening
you may have been brightening
she may have been brightening
we may have been brightening
you may have been brightening
they may have been brightening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not brighten
you may not brighten
she may not brighten
we may not brighten
you may not brighten
they may not brighten 	I may not be brightening
you may not be brightening
she may not be brightening
we may not be brightening
you may not be brightening
they may not be brightening	I may not have brightened
you may not have brightened
she may not have brightened
we may not have brightened
you may not have brightened
they may not have brightened	I may not have been brightening
you may not have been brightening
she may not have been brightening
we may not have been brightening
you may not have been brightening
they may not have been brightening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I brighten?
may you brighten?
may she brighten?
may we brighten?
may you brighten?
may they brighten? 	may I be brightening?
may you be brightening?
may she be brightening?
may we be brightening?
may you be brightening?
may they be brightening? 	may I have brightened?
may you have brightened?
may she have brightened?
may we have brightened?
may you have brightened?
may they have brightened? 	may I have been brightening?
may you have been brightening?
may she have been brightening?
may we have been brightening?
may you have been brightening?
may they have been brightening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not brighten?
may you not brighten?
may she not brighten?
may we not brighten?
may you not brighten?
may they not brighten? 	may I not be brightening?
may you not be brightening?
may she not be brightening?
may we not be brightening?
may you not be brightening?
may they not be brightening? 	may I not have brightened?
may you not have brightened?
may she not have brightened?
may we not have brightened?
may you not have brightened?
may they not have brightened? 	may I not have been brightening?
may you not have been brightening?
may she not have been brightening?
may we not have been brightening?
may you not have been brightening?
may they not have been brightening?