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 must not model you must not model he must not model we must not model you must not model they must not model
V-ing form
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
Perfect
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
V-ing perfect
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
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
must I not model? must you not model? must he not model? must we not model? must you not model? must they not model?
V-ing form
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?
Perfect
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?
V-ing perfect
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?