I must plunge you must plunge she must plunge we must plunge you must plunge they must plunge
V-ing form
I must be plunging you must be plunging she must be plunging we must be plunging you must be plunging they must be plunging
Perfect
I must have plunged you must have plunged she must have plunged we must have plunged you must have plunged they must have plunged
V-ing perfect
I must have been plunging you must have been plunging she must have been plunging we must have been plunging you must have been plunging they must have been plunging
Negation
Simple form
I must not plunge you must not plunge she must not plunge we must not plunge you must not plunge they must not plunge
V-ing form
I must not be plunging you must not be plunging she must not be plunging we must not be plunging you must not be plunging they must not be plunging
Perfect
I must not have plunged you must not have plunged she must not have plunged we must not have plunged you must not have plunged they must not have plunged
V-ing perfect
I must not have been plunging you must not have been plunging she must not have been plunging we must not have been plunging you must not have been plunging they must not have been plunging
Interrogative form
Simple form
must I plunge? must you plunge? must she plunge? must we plunge? must you plunge? must they plunge?
V-ing form
must I be plunging? must you be plunging? must she be plunging? must we be plunging? must you be plunging? must they be plunging?
Perfect
must I have plunged? must you have plunged? must she have plunged? must we have plunged? must you have plunged? must they have plunged?
V-ing perfect
must I have been plunging? must you have been plunging? must she have been plunging? must we have been plunging? must you have been plunging? must they have been plunging?
Interro-negative form
Simple form
must I not plunge? must you not plunge? must she not plunge? must we not plunge? must you not plunge? must they not plunge?
V-ing form
must I not be plunging? must you not be plunging? must she not be plunging? must we not be plunging? must you not be plunging? must they not be plunging?
Perfect
must I not have plunged? must you not have plunged? must she not have plunged? must we not have plunged? must you not have plunged? must they not have plunged?
V-ing perfect
must I not have been plunging? must you not have been plunging? must she not have been plunging? must we not have been plunging? must you not have been plunging? must they not have been plunging?