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 mustn't underwork you mustn't underwork he mustn't underwork we mustn't underwork you mustn't underwork they mustn't underwork	I mustn't be underworking you mustn't be underworking he mustn't be underworking we mustn't be underworking you mustn't be underworking they mustn't be underworking
Perfect	V-ing perfect
I mustn't have underworked you mustn't have underworked he mustn't have underworked we mustn't have underworked you mustn't have underworked they mustn't have underworked	I mustn't have been underworking you mustn't have been underworking he mustn't have been underworking we mustn't have been underworking you mustn't have been underworking they mustn't 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
mustn't I underwork? mustn't you underwork? mustn't he underwork? mustn't we underwork? mustn't you underwork? mustn't they underwork?	mustn't I be underworking? mustn't you be underworking? mustn't he be underworking? mustn't we be underworking? mustn't you be underworking? mustn't they be underworking?
Perfect	V-ing perfect
mustn't I have underworked? mustn't you have underworked? mustn't he have underworked? mustn't we have underworked? mustn't you have underworked? mustn't they have underworked?	mustn't I have been underworking? mustn't you have been underworking? mustn't he have been underworking? mustn't we have been underworking? mustn't you have been underworking? mustn't they have been underworking?