should underuse
Regular verb: underuse - underused- underused

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not underuse
you should not underuse
she should not underuse
we should not underuse
you should not underuse
they should not underuse 	I should not be underusing
you should not be underusing
she should not be underusing
we should not be underusing
you should not be underusing
they should not be underusing	I should not have underused
you should not have underused
she should not have underused
we should not have underused
you should not have underused
they should not have underused	I should not have been underusing
you should not have been underusing
she should not have been underusing
we should not have been underusing
you should not have been underusing
they should not have been underusing	

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

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