must model
Regular verb: model - modelled- modelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must model
you must model
he must model
we must model
you must model
they must model 	I must be modelling
you must be modelling
he must be modelling
we must be modelling
you must be modelling
they must be modelling	I must have modelled
you must have modelled
he must have modelled
we must have modelled
you must have modelled
they must have modelled	I must have been modelling
you must have been modelling
he must have been modelling
we must have been modelling
you must have been modelling
they must have been modelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not model
you must not model
he must not model
we must not model
you must not model
they must not model 	I must not be modelling
you must not be modelling
he must not be modelling
we must not be modelling
you must not be modelling
they must not be modelling	I must not have modelled
you must not have modelled
he must not have modelled
we must not have modelled
you must not have modelled
they must not have modelled	I must not have been modelling
you must not have been modelling
he must not have been modelling
we must not have been modelling
you must not have been modelling
they must not have been modelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I model?
must you model?
must he model?
must we model?
must you model?
must they model? 	must I be modelling?
must you be modelling?
must he be modelling?
must we be modelling?
must you be modelling?
must they be modelling? 	must I have modelled?
must you have modelled?
must he have modelled?
must we have modelled?
must you have modelled?
must they have modelled? 	must I have been modelling?
must you have been modelling?
must he have been modelling?
must we have been modelling?
must you have been modelling?
must they have been modelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not model?
must you not model?
must he not model?
must we not model?
must you not model?
must they not model? 	must I not be modelling?
must you not be modelling?
must he not be modelling?
must we not be modelling?
must you not be modelling?
must they not be modelling? 	must I not have modelled?
must you not have modelled?
must he not have modelled?
must we not have modelled?
must you not have modelled?
must they not have modelled? 	must I not have been modelling?
must you not have been modelling?
must he not have been modelling?
must we not have been modelling?
must you not have been modelling?
must they not have been modelling?