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