must marvel
Regular verb: marvel - marvelled- marvelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must marvel
you must marvel
she must marvel
we must marvel
you must marvel
they must marvel 	I must be marvelling
you must be marvelling
she must be marvelling
we must be marvelling
you must be marvelling
they must be marvelling	I must have marvelled
you must have marvelled
she must have marvelled
we must have marvelled
you must have marvelled
they must have marvelled	I must have been marvelling
you must have been marvelling
she must have been marvelling
we must have been marvelling
you must have been marvelling
they must have been marvelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't marvel
you mustn't marvel
she mustn't marvel
we mustn't marvel
you mustn't marvel
they mustn't marvel 	I mustn't be marvelling
you mustn't be marvelling
she mustn't be marvelling
we mustn't be marvelling
you mustn't be marvelling
they mustn't be marvelling	I mustn't have marvelled
you mustn't have marvelled
she mustn't have marvelled
we mustn't have marvelled
you mustn't have marvelled
they mustn't have marvelled	I mustn't have been marvelling
you mustn't have been marvelling
she mustn't have been marvelling
we mustn't have been marvelling
you mustn't have been marvelling
they mustn't have been marvelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I marvel?
must you marvel?
must she marvel?
must we marvel?
must you marvel?
must they marvel? 	must I be marvelling?
must you be marvelling?
must she be marvelling?
must we be marvelling?
must you be marvelling?
must they be marvelling? 	must I have marvelled?
must you have marvelled?
must she have marvelled?
must we have marvelled?
must you have marvelled?
must they have marvelled? 	must I have been marvelling?
must you have been marvelling?
must she have been marvelling?
must we have been marvelling?
must you have been marvelling?
must they have been marvelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I marvel?
mustn't you marvel?
mustn't she marvel?
mustn't we marvel?
mustn't you marvel?
mustn't they marvel? 	mustn't I be marvelling?
mustn't you be marvelling?
mustn't she be marvelling?
mustn't we be marvelling?
mustn't you be marvelling?
mustn't they be marvelling? 	mustn't I have marvelled?
mustn't you have marvelled?
mustn't she have marvelled?
mustn't we have marvelled?
mustn't you have marvelled?
mustn't they have marvelled? 	mustn't I have been marvelling?
mustn't you have been marvelling?
mustn't she have been marvelling?
mustn't we have been marvelling?
mustn't you have been marvelling?
mustn't they have been marvelling?