English verb conjugation
MUST FLAG

Regular verb: flag - flagged - flagged

Affirmation

Simple form	V-ing form
I must flag you must flag she must flag we must flag you must flag they must flag	I must be flagging you must be flagging she 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 she 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 she 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 must not flag you must not flag she must not flag we must not flag you must not flag they must not flag	I must not be flagging you must not be flagging she must not be flagging we must not be flagging you must not be flagging they must not be flagging
Perfect	V-ing perfect
I must not have flagged you must not have flagged she must not have flagged we must not have flagged you must not have flagged they must not have flagged	I must not have been flagging you must not have been flagging she must not have been flagging we must not have been flagging you must not have been flagging they must not have been flagging

Interrogative form

Simple form	V-ing form
must I flag? must you flag? must she flag? must we flag? must you flag? must they flag?	must I be flagging? must you be flagging? must she 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 she 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 she 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
must I not flag? must you not flag? must she not flag? must we not flag? must you not flag? must they not flag?	must I not be flagging? must you not be flagging? must she not be flagging? must we not be flagging? must you not be flagging? must they not be flagging?
Perfect	V-ing perfect
must I not have flagged? must you not have flagged? must she not have flagged? must we not have flagged? must you not have flagged? must they not have flagged?	must I not have been flagging? must you not have been flagging? must she not have been flagging? must we not have been flagging? must you not have been flagging? must they not have been flagging?