must possess
Regular verb: possess - possessed- possessed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must possess
you must possess
she must possess
we must possess
you must possess
they must possess 	I must be possessing
you must be possessing
she must be possessing
we must be possessing
you must be possessing
they must be possessing	I must have possessed
you must have possessed
she must have possessed
we must have possessed
you must have possessed
they must have possessed	I must have been possessing
you must have been possessing
she must have been possessing
we must have been possessing
you must have been possessing
they must have been possessing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't possess
you mustn't possess
she mustn't possess
we mustn't possess
you mustn't possess
they mustn't possess 	I mustn't be possessing
you mustn't be possessing
she mustn't be possessing
we mustn't be possessing
you mustn't be possessing
they mustn't be possessing	I mustn't have possessed
you mustn't have possessed
she mustn't have possessed
we mustn't have possessed
you mustn't have possessed
they mustn't have possessed	I mustn't have been possessing
you mustn't have been possessing
she mustn't have been possessing
we mustn't have been possessing
you mustn't have been possessing
they mustn't have been possessing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I possess?
must you possess?
must she possess?
must we possess?
must you possess?
must they possess? 	must I be possessing?
must you be possessing?
must she be possessing?
must we be possessing?
must you be possessing?
must they be possessing? 	must I have possessed?
must you have possessed?
must she have possessed?
must we have possessed?
must you have possessed?
must they have possessed? 	must I have been possessing?
must you have been possessing?
must she have been possessing?
must we have been possessing?
must you have been possessing?
must they have been possessing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I possess?
mustn't you possess?
mustn't she possess?
mustn't we possess?
mustn't you possess?
mustn't they possess? 	mustn't I be possessing?
mustn't you be possessing?
mustn't she be possessing?
mustn't we be possessing?
mustn't you be possessing?
mustn't they be possessing? 	mustn't I have possessed?
mustn't you have possessed?
mustn't she have possessed?
mustn't we have possessed?
mustn't you have possessed?
mustn't they have possessed? 	mustn't I have been possessing?
mustn't you have been possessing?
mustn't she have been possessing?
mustn't we have been possessing?
mustn't you have been possessing?
mustn't they have been possessing?