might underuse
Regular verb: underuse - underused- underused

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

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

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

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