may lighten
Regular verb: lighten - lightened- lightened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may lighten
you may lighten
she may lighten
we may lighten
you may lighten
they may lighten 	I may be lightening
you may be lightening
she may be lightening
we may be lightening
you may be lightening
they may be lightening	I may have lightened
you may have lightened
she may have lightened
we may have lightened
you may have lightened
they may have lightened	I may have been lightening
you may have been lightening
she may have been lightening
we may have been lightening
you may have been lightening
they may have been lightening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not lighten
you may not lighten
she may not lighten
we may not lighten
you may not lighten
they may not lighten 	I may not be lightening
you may not be lightening
she may not be lightening
we may not be lightening
you may not be lightening
they may not be lightening	I may not have lightened
you may not have lightened
she may not have lightened
we may not have lightened
you may not have lightened
they may not have lightened	I may not have been lightening
you may not have been lightening
she may not have been lightening
we may not have been lightening
you may not have been lightening
they may not have been lightening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I lighten?
may you lighten?
may she lighten?
may we lighten?
may you lighten?
may they lighten? 	may I be lightening?
may you be lightening?
may she be lightening?
may we be lightening?
may you be lightening?
may they be lightening? 	may I have lightened?
may you have lightened?
may she have lightened?
may we have lightened?
may you have lightened?
may they have lightened? 	may I have been lightening?
may you have been lightening?
may she have been lightening?
may we have been lightening?
may you have been lightening?
may they have been lightening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not lighten?
may you not lighten?
may she not lighten?
may we not lighten?
may you not lighten?
may they not lighten? 	may I not be lightening?
may you not be lightening?
may she not be lightening?
may we not be lightening?
may you not be lightening?
may they not be lightening? 	may I not have lightened?
may you not have lightened?
may she not have lightened?
may we not have lightened?
may you not have lightened?
may they not have lightened? 	may I not have been lightening?
may you not have been lightening?
may she not have been lightening?
may we not have been lightening?
may you not have been lightening?
may they not have been lightening?