I must model you must model he must model we must model you must model they must model
V-ing form
I must be modelling you must be modelling he must be modelling we must be modelling you must be modelling they must be modelling
Perfect
I must have modelled you must have modelled he must have modelled we must have modelled you must have modelled they must have modelled
V-ing perfect
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
I mustn't model you mustn't model he mustn't model we mustn't model you mustn't model they mustn't model
V-ing form
I mustn't be modelling you mustn't be modelling he mustn't be modelling we mustn't be modelling you mustn't be modelling they mustn't be modelling
Perfect
I mustn't have modelled you mustn't have modelled he mustn't have modelled we mustn't have modelled you mustn't have modelled they mustn't have modelled
V-ing perfect
I mustn't have been modelling you mustn't have been modelling he mustn't have been modelling we mustn't have been modelling you mustn't have been modelling they mustn't have been modelling
Interrogative form
Simple form
must I model? must you model? must he model? must we model? must you model? must they model?
V-ing form
must I be modelling? must you be modelling? must he be modelling? must we be modelling? must you be modelling? must they be modelling?
Perfect
must I have modelled? must you have modelled? must he have modelled? must we have modelled? must you have modelled? must they have modelled?
V-ing perfect
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
mustn't I model? mustn't you model? mustn't he model? mustn't we model? mustn't you model? mustn't they model?
V-ing form
mustn't I be modelling? mustn't you be modelling? mustn't he be modelling? mustn't we be modelling? mustn't you be modelling? mustn't they be modelling?
Perfect
mustn't I have modelled? mustn't you have modelled? mustn't he have modelled? mustn't we have modelled? mustn't you have modelled? mustn't they have modelled?
V-ing perfect
mustn't I have been modelling? mustn't you have been modelling? mustn't he have been modelling? mustn't we have been modelling? mustn't you have been modelling? mustn't they have been modelling?