may lessen
Regular verb: lessen - lessened- lessened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may lessen
you may lessen
he may lessen
we may lessen
you may lessen
they may lessen 	I may be lessening
you may be lessening
he may be lessening
we may be lessening
you may be lessening
they may be lessening	I may have lessened
you may have lessened
he may have lessened
we may have lessened
you may have lessened
they may have lessened	I may have been lessening
you may have been lessening
he may have been lessening
we may have been lessening
you may have been lessening
they may have been lessening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not lessen
you may not lessen
he may not lessen
we may not lessen
you may not lessen
they may not lessen 	I may not be lessening
you may not be lessening
he may not be lessening
we may not be lessening
you may not be lessening
they may not be lessening	I may not have lessened
you may not have lessened
he may not have lessened
we may not have lessened
you may not have lessened
they may not have lessened	I may not have been lessening
you may not have been lessening
he may not have been lessening
we may not have been lessening
you may not have been lessening
they may not have been lessening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I lessen?
may you lessen?
may he lessen?
may we lessen?
may you lessen?
may they lessen? 	may I be lessening?
may you be lessening?
may he be lessening?
may we be lessening?
may you be lessening?
may they be lessening? 	may I have lessened?
may you have lessened?
may he have lessened?
may we have lessened?
may you have lessened?
may they have lessened? 	may I have been lessening?
may you have been lessening?
may he have been lessening?
may we have been lessening?
may you have been lessening?
may they have been lessening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not lessen?
may you not lessen?
may he not lessen?
may we not lessen?
may you not lessen?
may they not lessen? 	may I not be lessening?
may you not be lessening?
may he not be lessening?
may we not be lessening?
may you not be lessening?
may they not be lessening? 	may I not have lessened?
may you not have lessened?
may he not have lessened?
may we not have lessened?
may you not have lessened?
may they not have lessened? 	may I not have been lessening?
may you not have been lessening?
may he not have been lessening?
may we not have been lessening?
may you not have been lessening?
may they not have been lessening?