English verb conjugation
MUST WORK

Regular verb: work - worked - worked

Affirmation

Simple form	V-ing form
I must work you must work she must work we must work you must work they must work	I must be working you must be working she must be working we must be working you must be working they must be working
Perfect	V-ing perfect
I must have worked you must have worked she must have worked we must have worked you must have worked they must have worked	I must have been working you must have been working she must have been working we must have been working you must have been working they must have been working

Negation

Simple form	V-ing form
I must not work you must not work she must not work we must not work you must not work they must not work	I must not be working you must not be working she must not be working we must not be working you must not be working they must not be working
Perfect	V-ing perfect
I must not have worked you must not have worked she must not have worked we must not have worked you must not have worked they must not have worked	I must not have been working you must not have been working she must not have been working we must not have been working you must not have been working they must not have been working

Interrogative form

Simple form	V-ing form
must I work? must you work? must she work? must we work? must you work? must they work?	must I be working? must you be working? must she be working? must we be working? must you be working? must they be working?
Perfect	V-ing perfect
must I have worked? must you have worked? must she have worked? must we have worked? must you have worked? must they have worked?	must I have been working? must you have been working? must she have been working? must we have been working? must you have been working? must they have been working?

Interro-negative form

Simple form	V-ing form
must I not work? must you not work? must she not work? must we not work? must you not work? must they not work?	must I not be working? must you not be working? must she not be working? must we not be working? must you not be working? must they not be working?
Perfect	V-ing perfect
must I not have worked? must you not have worked? must she not have worked? must we not have worked? must you not have worked? must they not have worked?	must I not have been working? must you not have been working? must she not have been working? must we not have been working? must you not have been working? must they not have been working?