must erupt
Regular verb: erupt - erupted- erupted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?