Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must expert you must expert he must expert we must expert you must expert they must expert
V-ing form
I must be experting you must be experting he must be experting we must be experting you must be experting they must be experting
Perfect
I must have experted you must have experted he must have experted we must have experted you must have experted they must have experted
V-ing perfect
I must have been experting you must have been experting he must have been experting we must have been experting you must have been experting they must have been experting
Negation
Simple form
I mustn't expert you mustn't expert he mustn't expert we mustn't expert you mustn't expert they mustn't expert
V-ing form
I mustn't be experting you mustn't be experting he mustn't be experting we mustn't be experting you mustn't be experting they mustn't be experting
Perfect
I mustn't have experted you mustn't have experted he mustn't have experted we mustn't have experted you mustn't have experted they mustn't have experted
V-ing perfect
I mustn't have been experting you mustn't have been experting he mustn't have been experting we mustn't have been experting you mustn't have been experting they mustn't have been experting
Interrogative form
Simple form
must I expert? must you expert? must he expert? must we expert? must you expert? must they expert?
V-ing form
must I be experting? must you be experting? must he be experting? must we be experting? must you be experting? must they be experting?
Perfect
must I have experted? must you have experted? must he have experted? must we have experted? must you have experted? must they have experted?
V-ing perfect
must I have been experting? must you have been experting? must he have been experting? must we have been experting? must you have been experting? must they have been experting?
Interro-negative form
Simple form
mustn't I expert? mustn't you expert? mustn't he expert? mustn't we expert? mustn't you expert? mustn't they expert?
V-ing form
mustn't I be experting? mustn't you be experting? mustn't he be experting? mustn't we be experting? mustn't you be experting? mustn't they be experting?
Perfect
mustn't I have experted? mustn't you have experted? mustn't he have experted? mustn't we have experted? mustn't you have experted? mustn't they have experted?
V-ing perfect
mustn't I have been experting? mustn't you have been experting? mustn't he have been experting? mustn't we have been experting? mustn't you have been experting? mustn't they have been experting?