I must waltz you must waltz she must waltz we must waltz you must waltz they must waltz
V-ing form
I must be waltzing you must be waltzing she must be waltzing we must be waltzing you must be waltzing they must be waltzing
Perfect
I must have waltzed you must have waltzed she must have waltzed we must have waltzed you must have waltzed they must have waltzed
V-ing perfect
I must have been waltzing you must have been waltzing she must have been waltzing we must have been waltzing you must have been waltzing they must have been waltzing
Negation
Simple form
I mustn't waltz you mustn't waltz she mustn't waltz we mustn't waltz you mustn't waltz they mustn't waltz
V-ing form
I mustn't be waltzing you mustn't be waltzing she mustn't be waltzing we mustn't be waltzing you mustn't be waltzing they mustn't be waltzing
Perfect
I mustn't have waltzed you mustn't have waltzed she mustn't have waltzed we mustn't have waltzed you mustn't have waltzed they mustn't have waltzed
V-ing perfect
I mustn't have been waltzing you mustn't have been waltzing she mustn't have been waltzing we mustn't have been waltzing you mustn't have been waltzing they mustn't have been waltzing
Interrogative form
Simple form
must I waltz? must you waltz? must she waltz? must we waltz? must you waltz? must they waltz?
V-ing form
must I be waltzing? must you be waltzing? must she be waltzing? must we be waltzing? must you be waltzing? must they be waltzing?
Perfect
must I have waltzed? must you have waltzed? must she have waltzed? must we have waltzed? must you have waltzed? must they have waltzed?
V-ing perfect
must I have been waltzing? must you have been waltzing? must she have been waltzing? must we have been waltzing? must you have been waltzing? must they have been waltzing?
Interro-negative form
Simple form
mustn't I waltz? mustn't you waltz? mustn't she waltz? mustn't we waltz? mustn't you waltz? mustn't they waltz?
V-ing form
mustn't I be waltzing? mustn't you be waltzing? mustn't she be waltzing? mustn't we be waltzing? mustn't you be waltzing? mustn't they be waltzing?
Perfect
mustn't I have waltzed? mustn't you have waltzed? mustn't she have waltzed? mustn't we have waltzed? mustn't you have waltzed? mustn't they have waltzed?
V-ing perfect
mustn't I have been waltzing? mustn't you have been waltzing? mustn't she have been waltzing? mustn't we have been waltzing? mustn't you have been waltzing? mustn't they have been waltzing?