English verb conjugation
MUST EXPIRE

Regular verb: expire - expired - expired

Affirmation

Simple form	V-ing form
I must expire you must expire he must expire we must expire you must expire they must expire	I must be expiring you must be expiring he must be expiring we must be expiring you must be expiring they must be expiring
Perfect	V-ing perfect
I must have expired you must have expired he must have expired we must have expired you must have expired they must have expired	I must have been expiring you must have been expiring he must have been expiring we must have been expiring you must have been expiring they must have been expiring

Negation

Simple form	V-ing form
I mustn't expire you mustn't expire he mustn't expire we mustn't expire you mustn't expire they mustn't expire	I mustn't be expiring you mustn't be expiring he mustn't be expiring we mustn't be expiring you mustn't be expiring they mustn't be expiring
Perfect	V-ing perfect
I mustn't have expired you mustn't have expired he mustn't have expired we mustn't have expired you mustn't have expired they mustn't have expired	I mustn't have been expiring you mustn't have been expiring he mustn't have been expiring we mustn't have been expiring you mustn't have been expiring they mustn't have been expiring

Interrogative form

Simple form	V-ing form
must I expire? must you expire? must he expire? must we expire? must you expire? must they expire?	must I be expiring? must you be expiring? must he be expiring? must we be expiring? must you be expiring? must they be expiring?
Perfect	V-ing perfect
must I have expired? must you have expired? must he have expired? must we have expired? must you have expired? must they have expired?	must I have been expiring? must you have been expiring? must he have been expiring? must we have been expiring? must you have been expiring? must they have been expiring?

Interro-negative form

Simple form	V-ing form
mustn't I expire? mustn't you expire? mustn't he expire? mustn't we expire? mustn't you expire? mustn't they expire?	mustn't I be expiring? mustn't you be expiring? mustn't he be expiring? mustn't we be expiring? mustn't you be expiring? mustn't they be expiring?
Perfect	V-ing perfect
mustn't I have expired? mustn't you have expired? mustn't he have expired? mustn't we have expired? mustn't you have expired? mustn't they have expired?	mustn't I have been expiring? mustn't you have been expiring? mustn't he have been expiring? mustn't we have been expiring? mustn't you have been expiring? mustn't they have been expiring?