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 must not expire you must not expire he must not expire we must not expire you must not expire they must not expire	I must not be expiring you must not be expiring he must not be expiring we must not be expiring you must not be expiring they must not be expiring
Perfect	V-ing perfect
I must not have expired you must not have expired he must not have expired we must not have expired you must not have expired they must not have expired	I must not have been expiring you must not have been expiring he must not have been expiring we must not have been expiring you must not have been expiring they must not 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
must I not expire? must you not expire? must he not expire? must we not expire? must you not expire? must they not expire?	must I not be expiring? must you not be expiring? must he not be expiring? must we not be expiring? must you not be expiring? must they not be expiring?
Perfect	V-ing perfect
must I not have expired? must you not have expired? must he not have expired? must we not have expired? must you not have expired? must they not have expired?	must I not have been expiring? must you not have been expiring? must he not have been expiring? must we not have been expiring? must you not have been expiring? must they not have been expiring?