may underachieve
Regular verb: underachieve - underachieved- underachieved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may underachieve
you may underachieve
he may underachieve
we may underachieve
you may underachieve
they may underachieve 	I may be underachieving
you may be underachieving
he may be underachieving
we may be underachieving
you may be underachieving
they may be underachieving	I may have underachieved
you may have underachieved
he may have underachieved
we may have underachieved
you may have underachieved
they may have underachieved	I may have been underachieving
you may have been underachieving
he may have been underachieving
we may have been underachieving
you may have been underachieving
they may have been underachieving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't underachieve
you mayn't underachieve
he mayn't underachieve
we mayn't underachieve
you mayn't underachieve
they mayn't underachieve 	I mayn't be underachieving
you mayn't be underachieving
he mayn't be underachieving
we mayn't be underachieving
you mayn't be underachieving
they mayn't be underachieving	I mayn't have underachieved
you mayn't have underachieved
he mayn't have underachieved
we mayn't have underachieved
you mayn't have underachieved
they mayn't have underachieved	I mayn't have been underachieving
you mayn't have been underachieving
he mayn't have been underachieving
we mayn't have been underachieving
you mayn't have been underachieving
they mayn't have been underachieving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I underachieve?
may you underachieve?
may he underachieve?
may we underachieve?
may you underachieve?
may they underachieve? 	may I be underachieving?
may you be underachieving?
may he be underachieving?
may we be underachieving?
may you be underachieving?
may they be underachieving? 	may I have underachieved?
may you have underachieved?
may he have underachieved?
may we have underachieved?
may you have underachieved?
may they have underachieved? 	may I have been underachieving?
may you have been underachieving?
may he have been underachieving?
may we have been underachieving?
may you have been underachieving?
may they have been underachieving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I underachieve?
mayn't you underachieve?
mayn't he underachieve?
mayn't we underachieve?
mayn't you underachieve?
mayn't they underachieve? 	mayn't I be underachieving?
mayn't you be underachieving?
mayn't he be underachieving?
mayn't we be underachieving?
mayn't you be underachieving?
mayn't they be underachieving? 	mayn't I have underachieved?
mayn't you have underachieved?
mayn't he have underachieved?
mayn't we have underachieved?
mayn't you have underachieved?
mayn't they have underachieved? 	mayn't I have been underachieving?
mayn't you have been underachieving?
mayn't he have been underachieving?
mayn't we have been underachieving?
mayn't you have been underachieving?
mayn't they have been underachieving?