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