I must charm you must charm she must charm we must charm you must charm they must charm
V-ing form
I must be charming you must be charming she must be charming we must be charming you must be charming they must be charming
Perfect
I must have charmed you must have charmed she must have charmed we must have charmed you must have charmed they must have charmed
V-ing perfect
I must have been charming you must have been charming she must have been charming we must have been charming you must have been charming they must have been charming
Negation
Simple form
I must not charm you must not charm she must not charm we must not charm you must not charm they must not charm
V-ing form
I must not be charming you must not be charming she must not be charming we must not be charming you must not be charming they must not be charming
Perfect
I must not have charmed you must not have charmed she must not have charmed we must not have charmed you must not have charmed they must not have charmed
V-ing perfect
I must not have been charming you must not have been charming she must not have been charming we must not have been charming you must not have been charming they must not have been charming
Interrogative form
Simple form
must I charm? must you charm? must she charm? must we charm? must you charm? must they charm?
V-ing form
must I be charming? must you be charming? must she be charming? must we be charming? must you be charming? must they be charming?
Perfect
must I have charmed? must you have charmed? must she have charmed? must we have charmed? must you have charmed? must they have charmed?
V-ing perfect
must I have been charming? must you have been charming? must she have been charming? must we have been charming? must you have been charming? must they have been charming?
Interro-negative form
Simple form
must I not charm? must you not charm? must she not charm? must we not charm? must you not charm? must they not charm?
V-ing form
must I not be charming? must you not be charming? must she not be charming? must we not be charming? must you not be charming? must they not be charming?
Perfect
must I not have charmed? must you not have charmed? must she not have charmed? must we not have charmed? must you not have charmed? must they not have charmed?
V-ing perfect
must I not have been charming? must you not have been charming? must she not have been charming? must we not have been charming? must you not have been charming? must they not have been charming?