shall underuse
Regular verb: underuse - underused- underused

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

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

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

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