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