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