English verb conjugation
MUST WORK

Regular verb: work - worked - worked

Affirmation

Simple form	V-ing form
I must work you must work he must work we must work you must work they must work	I must be working you must be working he 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 he 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 he 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 mustn't work you mustn't work he mustn't work we mustn't work you mustn't work they mustn't work	I mustn't be working you mustn't be working he mustn't be working we mustn't be working you mustn't be working they mustn't be working
Perfect	V-ing perfect
I mustn't have worked you mustn't have worked he mustn't have worked we mustn't have worked you mustn't have worked they mustn't have worked	I mustn't have been working you mustn't have been working he mustn't have been working we mustn't have been working you mustn't have been working they mustn't have been working

Interrogative form

Simple form	V-ing form
must I work? must you work? must he work? must we work? must you work? must they work?	must I be working? must you be working? must he 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 he 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 he 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
mustn't I work? mustn't you work? mustn't he work? mustn't we work? mustn't you work? mustn't they work?	mustn't I be working? mustn't you be working? mustn't he be working? mustn't we be working? mustn't you be working? mustn't they be working?
Perfect	V-ing perfect
mustn't I have worked? mustn't you have worked? mustn't he have worked? mustn't we have worked? mustn't you have worked? mustn't they have worked?	mustn't I have been working? mustn't you have been working? mustn't he have been working? mustn't we have been working? mustn't you have been working? mustn't they have been working?