English verb conjugation
MUST ERUPT

Regular verb: erupt - erupted - erupted

Affirmation

Simple form	V-ing form
I must erupt you must erupt he must erupt we must erupt you must erupt they must erupt	I must be erupting you must be erupting he must be erupting we must be erupting you must be erupting they must be erupting
Perfect	V-ing perfect
I must have erupted you must have erupted he must have erupted we must have erupted you must have erupted they must have erupted	I must have been erupting you must have been erupting he must have been erupting we must have been erupting you must have been erupting they must have been erupting

Negation

Simple form	V-ing form
I must not erupt you must not erupt he must not erupt we must not erupt you must not erupt they must not erupt	I must not be erupting you must not be erupting he must not be erupting we must not be erupting you must not be erupting they must not be erupting
Perfect	V-ing perfect
I must not have erupted you must not have erupted he must not have erupted we must not have erupted you must not have erupted they must not have erupted	I must not have been erupting you must not have been erupting he must not have been erupting we must not have been erupting you must not have been erupting they must not have been erupting

Interrogative form

Simple form	V-ing form
must I erupt? must you erupt? must he erupt? must we erupt? must you erupt? must they erupt?	must I be erupting? must you be erupting? must he be erupting? must we be erupting? must you be erupting? must they be erupting?
Perfect	V-ing perfect
must I have erupted? must you have erupted? must he have erupted? must we have erupted? must you have erupted? must they have erupted?	must I have been erupting? must you have been erupting? must he have been erupting? must we have been erupting? must you have been erupting? must they have been erupting?

Interro-negative form

Simple form	V-ing form
must I not erupt? must you not erupt? must he not erupt? must we not erupt? must you not erupt? must they not erupt?	must I not be erupting? must you not be erupting? must he not be erupting? must we not be erupting? must you not be erupting? must they not be erupting?
Perfect	V-ing perfect
must I not have erupted? must you not have erupted? must he not have erupted? must we not have erupted? must you not have erupted? must they not have erupted?	must I not have been erupting? must you not have been erupting? must he not have been erupting? must we not have been erupting? must you not have been erupting? must they not have been erupting?