I must cut you must cut he must cut we must cut you must cut they must cut
V-ing form
I must be cutting you must be cutting he must be cutting we must be cutting you must be cutting they must be cutting
Perfect
I must have cut you must have cut he must have cut we must have cut you must have cut they must have cut
V-ing perfect
I must have been cutting you must have been cutting he must have been cutting we must have been cutting you must have been cutting they must have been cutting
Negation
Simple form
I mustn't cut you mustn't cut he mustn't cut we mustn't cut you mustn't cut they mustn't cut
V-ing form
I mustn't be cutting you mustn't be cutting he mustn't be cutting we mustn't be cutting you mustn't be cutting they mustn't be cutting
Perfect
I mustn't have cut you mustn't have cut he mustn't have cut we mustn't have cut you mustn't have cut they mustn't have cut
V-ing perfect
I mustn't have been cutting you mustn't have been cutting he mustn't have been cutting we mustn't have been cutting you mustn't have been cutting they mustn't have been cutting
Interrogative form
Simple form
must I cut? must you cut? must he cut? must we cut? must you cut? must they cut?
V-ing form
must I be cutting? must you be cutting? must he be cutting? must we be cutting? must you be cutting? must they be cutting?
Perfect
must I have cut? must you have cut? must he have cut? must we have cut? must you have cut? must they have cut?
V-ing perfect
must I have been cutting? must you have been cutting? must he have been cutting? must we have been cutting? must you have been cutting? must they have been cutting?
Interro-negative form
Simple form
mustn't I cut? mustn't you cut? mustn't he cut? mustn't we cut? mustn't you cut? mustn't they cut?
V-ing form
mustn't I be cutting? mustn't you be cutting? mustn't he be cutting? mustn't we be cutting? mustn't you be cutting? mustn't they be cutting?
Perfect
mustn't I have cut? mustn't you have cut? mustn't he have cut? mustn't we have cut? mustn't you have cut? mustn't they have cut?
V-ing perfect
mustn't I have been cutting? mustn't you have been cutting? mustn't he have been cutting? mustn't we have been cutting? mustn't you have been cutting? mustn't they have been cutting?