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