English verb conjugation
SHALL UNDERUSE

Regular verb: underuse - underused - underused

Affirmation

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