English verb conjugation
MUST FLAG

Regular verb: flag - flagged - flagged

Affirmation

Simple form	V-ing form
I must flag you must flag he must flag we must flag you must flag they must flag	I must be flagging you must be flagging he must be flagging we must be flagging you must be flagging they must be flagging
Perfect	V-ing perfect
I must have flagged you must have flagged he must have flagged we must have flagged you must have flagged they must have flagged	I must have been flagging you must have been flagging he must have been flagging we must have been flagging you must have been flagging they must have been flagging

Negation

Simple form	V-ing form
I mustn't flag you mustn't flag he mustn't flag we mustn't flag you mustn't flag they mustn't flag	I mustn't be flagging you mustn't be flagging he mustn't be flagging we mustn't be flagging you mustn't be flagging they mustn't be flagging
Perfect	V-ing perfect
I mustn't have flagged you mustn't have flagged he mustn't have flagged we mustn't have flagged you mustn't have flagged they mustn't have flagged	I mustn't have been flagging you mustn't have been flagging he mustn't have been flagging we mustn't have been flagging you mustn't have been flagging they mustn't have been flagging

Interrogative form

Simple form	V-ing form
must I flag? must you flag? must he flag? must we flag? must you flag? must they flag?	must I be flagging? must you be flagging? must he be flagging? must we be flagging? must you be flagging? must they be flagging?
Perfect	V-ing perfect
must I have flagged? must you have flagged? must he have flagged? must we have flagged? must you have flagged? must they have flagged?	must I have been flagging? must you have been flagging? must he have been flagging? must we have been flagging? must you have been flagging? must they have been flagging?

Interro-negative form

Simple form	V-ing form
mustn't I flag? mustn't you flag? mustn't he flag? mustn't we flag? mustn't you flag? mustn't they flag?	mustn't I be flagging? mustn't you be flagging? mustn't he be flagging? mustn't we be flagging? mustn't you be flagging? mustn't they be flagging?
Perfect	V-ing perfect
mustn't I have flagged? mustn't you have flagged? mustn't he have flagged? mustn't we have flagged? mustn't you have flagged? mustn't they have flagged?	mustn't I have been flagging? mustn't you have been flagging? mustn't he have been flagging? mustn't we have been flagging? mustn't you have been flagging? mustn't they have been flagging?