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 mustn't erupt you mustn't erupt he mustn't erupt we mustn't erupt you mustn't erupt they mustn't erupt	I mustn't be erupting you mustn't be erupting he mustn't be erupting we mustn't be erupting you mustn't be erupting they mustn't be erupting
Perfect	V-ing perfect
I mustn't have erupted you mustn't have erupted he mustn't have erupted we mustn't have erupted you mustn't have erupted they mustn't have erupted	I mustn't have been erupting you mustn't have been erupting he mustn't have been erupting we mustn't have been erupting you mustn't have been erupting they mustn't 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
mustn't I erupt? mustn't you erupt? mustn't he erupt? mustn't we erupt? mustn't you erupt? mustn't they erupt?	mustn't I be erupting? mustn't you be erupting? mustn't he be erupting? mustn't we be erupting? mustn't you be erupting? mustn't they be erupting?
Perfect	V-ing perfect
mustn't I have erupted? mustn't you have erupted? mustn't he have erupted? mustn't we have erupted? mustn't you have erupted? mustn't they have erupted?	mustn't I have been erupting? mustn't you have been erupting? mustn't he have been erupting? mustn't we have been erupting? mustn't you have been erupting? mustn't they have been erupting?