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