must libel
Regular verb: libel - libelled- libelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must libel
you must libel
she must libel
we must libel
you must libel
they must libel 	I must be libelling
you must be libelling
she must be libelling
we must be libelling
you must be libelling
they must be libelling	I must have libelled
you must have libelled
she must have libelled
we must have libelled
you must have libelled
they must have libelled	I must have been libelling
you must have been libelling
she must have been libelling
we must have been libelling
you must have been libelling
they must have been libelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't libel
you mustn't libel
she mustn't libel
we mustn't libel
you mustn't libel
they mustn't libel 	I mustn't be libelling
you mustn't be libelling
she mustn't be libelling
we mustn't be libelling
you mustn't be libelling
they mustn't be libelling	I mustn't have libelled
you mustn't have libelled
she mustn't have libelled
we mustn't have libelled
you mustn't have libelled
they mustn't have libelled	I mustn't have been libelling
you mustn't have been libelling
she mustn't have been libelling
we mustn't have been libelling
you mustn't have been libelling
they mustn't have been libelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I libel?
must you libel?
must she libel?
must we libel?
must you libel?
must they libel? 	must I be libelling?
must you be libelling?
must she be libelling?
must we be libelling?
must you be libelling?
must they be libelling? 	must I have libelled?
must you have libelled?
must she have libelled?
must we have libelled?
must you have libelled?
must they have libelled? 	must I have been libelling?
must you have been libelling?
must she have been libelling?
must we have been libelling?
must you have been libelling?
must they have been libelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I libel?
mustn't you libel?
mustn't she libel?
mustn't we libel?
mustn't you libel?
mustn't they libel? 	mustn't I be libelling?
mustn't you be libelling?
mustn't she be libelling?
mustn't we be libelling?
mustn't you be libelling?
mustn't they be libelling? 	mustn't I have libelled?
mustn't you have libelled?
mustn't she have libelled?
mustn't we have libelled?
mustn't you have libelled?
mustn't they have libelled? 	mustn't I have been libelling?
mustn't you have been libelling?
mustn't she have been libelling?
mustn't we have been libelling?
mustn't you have been libelling?
mustn't they have been libelling?