English verb conjugation
MUST UNDERWORK

Regular verb: underwork - underworked - underworked

Affirmation

Simple form	V-ing form
I must underwork you must underwork he must underwork we must underwork you must underwork they must underwork	I must be underworking you must be underworking he must be underworking we must be underworking you must be underworking they must be underworking
Perfect	V-ing perfect
I must have underworked you must have underworked he must have underworked we must have underworked you must have underworked they must have underworked	I must have been underworking you must have been underworking he must have been underworking we must have been underworking you must have been underworking they must have been underworking

Negation

Simple form	V-ing form
I must not underwork you must not underwork he must not underwork we must not underwork you must not underwork they must not underwork	I must not be underworking you must not be underworking he must not be underworking we must not be underworking you must not be underworking they must not be underworking
Perfect	V-ing perfect
I must not have underworked you must not have underworked he must not have underworked we must not have underworked you must not have underworked they must not have underworked	I must not have been underworking you must not have been underworking he must not have been underworking we must not have been underworking you must not have been underworking they must not have been underworking

Interrogative form

Simple form	V-ing form
must I underwork? must you underwork? must he underwork? must we underwork? must you underwork? must they underwork?	must I be underworking? must you be underworking? must he be underworking? must we be underworking? must you be underworking? must they be underworking?
Perfect	V-ing perfect
must I have underworked? must you have underworked? must he have underworked? must we have underworked? must you have underworked? must they have underworked?	must I have been underworking? must you have been underworking? must he have been underworking? must we have been underworking? must you have been underworking? must they have been underworking?

Interro-negative form

Simple form	V-ing form
must I not underwork? must you not underwork? must he not underwork? must we not underwork? must you not underwork? must they not underwork?	must I not be underworking? must you not be underworking? must he not be underworking? must we not be underworking? must you not be underworking? must they not be underworking?
Perfect	V-ing perfect
must I not have underworked? must you not have underworked? must he not have underworked? must we not have underworked? must you not have underworked? must they not have underworked?	must I not have been underworking? must you not have been underworking? must he not have been underworking? must we not have been underworking? must you not have been underworking? must they not have been underworking?