may underuse
Regular verb: underuse - underused- underused

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may underuse
you may underuse
she may underuse
we may underuse
you may underuse
they may underuse 	I may be underusing
you may be underusing
she may be underusing
we may be underusing
you may be underusing
they may be underusing	I may have underused
you may have underused
she may have underused
we may have underused
you may have underused
they may have underused	I may have been underusing
you may have been underusing
she may have been underusing
we may have been underusing
you may have been underusing
they may have been underusing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't underuse
you mayn't underuse
she mayn't underuse
we mayn't underuse
you mayn't underuse
they mayn't underuse 	I mayn't be underusing
you mayn't be underusing
she mayn't be underusing
we mayn't be underusing
you mayn't be underusing
they mayn't be underusing	I mayn't have underused
you mayn't have underused
she mayn't have underused
we mayn't have underused
you mayn't have underused
they mayn't have underused	I mayn't have been underusing
you mayn't have been underusing
she mayn't have been underusing
we mayn't have been underusing
you mayn't have been underusing
they mayn't have been underusing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I underuse?
may you underuse?
may she underuse?
may we underuse?
may you underuse?
may they underuse? 	may I be underusing?
may you be underusing?
may she be underusing?
may we be underusing?
may you be underusing?
may they be underusing? 	may I have underused?
may you have underused?
may she have underused?
may we have underused?
may you have underused?
may they have underused? 	may I have been underusing?
may you have been underusing?
may she have been underusing?
may we have been underusing?
may you have been underusing?
may they have been underusing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I underuse?
mayn't you underuse?
mayn't she underuse?
mayn't we underuse?
mayn't you underuse?
mayn't they underuse? 	mayn't I be underusing?
mayn't you be underusing?
mayn't she be underusing?
mayn't we be underusing?
mayn't you be underusing?
mayn't they be underusing? 	mayn't I have underused?
mayn't you have underused?
mayn't she have underused?
mayn't we have underused?
mayn't you have underused?
mayn't they have underused? 	mayn't I have been underusing?
mayn't you have been underusing?
mayn't she have been underusing?
mayn't we have been underusing?
mayn't you have been underusing?
mayn't they have been underusing?