must fuel
Regular verb: fuel - fuelled- fuelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fuel
you must fuel
she must fuel
we must fuel
you must fuel
they must fuel 	I must be fuelling
you must be fuelling
she must be fuelling
we must be fuelling
you must be fuelling
they must be fuelling	I must have fuelled
you must have fuelled
she must have fuelled
we must have fuelled
you must have fuelled
they must have fuelled	I must have been fuelling
you must have been fuelling
she must have been fuelling
we must have been fuelling
you must have been fuelling
they must have been fuelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't fuel
you mustn't fuel
she mustn't fuel
we mustn't fuel
you mustn't fuel
they mustn't fuel 	I mustn't be fuelling
you mustn't be fuelling
she mustn't be fuelling
we mustn't be fuelling
you mustn't be fuelling
they mustn't be fuelling	I mustn't have fuelled
you mustn't have fuelled
she mustn't have fuelled
we mustn't have fuelled
you mustn't have fuelled
they mustn't have fuelled	I mustn't have been fuelling
you mustn't have been fuelling
she mustn't have been fuelling
we mustn't have been fuelling
you mustn't have been fuelling
they mustn't have been fuelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fuel?
must you fuel?
must she fuel?
must we fuel?
must you fuel?
must they fuel? 	must I be fuelling?
must you be fuelling?
must she be fuelling?
must we be fuelling?
must you be fuelling?
must they be fuelling? 	must I have fuelled?
must you have fuelled?
must she have fuelled?
must we have fuelled?
must you have fuelled?
must they have fuelled? 	must I have been fuelling?
must you have been fuelling?
must she have been fuelling?
must we have been fuelling?
must you have been fuelling?
must they have been fuelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I fuel?
mustn't you fuel?
mustn't she fuel?
mustn't we fuel?
mustn't you fuel?
mustn't they fuel? 	mustn't I be fuelling?
mustn't you be fuelling?
mustn't she be fuelling?
mustn't we be fuelling?
mustn't you be fuelling?
mustn't they be fuelling? 	mustn't I have fuelled?
mustn't you have fuelled?
mustn't she have fuelled?
mustn't we have fuelled?
mustn't you have fuelled?
mustn't they have fuelled? 	mustn't I have been fuelling?
mustn't you have been fuelling?
mustn't she have been fuelling?
mustn't we have been fuelling?
mustn't you have been fuelling?
mustn't they have been fuelling?