I must own you must own she must own we must own you must own they must own
V-ing form
I must be owning you must be owning she must be owning we must be owning you must be owning they must be owning
Perfect
I must have owned you must have owned she must have owned we must have owned you must have owned they must have owned
V-ing perfect
I must have been owning you must have been owning she must have been owning we must have been owning you must have been owning they must have been owning
Negation
Simple form
I mustn't own you mustn't own she mustn't own we mustn't own you mustn't own they mustn't own
V-ing form
I mustn't be owning you mustn't be owning she mustn't be owning we mustn't be owning you mustn't be owning they mustn't be owning
Perfect
I mustn't have owned you mustn't have owned she mustn't have owned we mustn't have owned you mustn't have owned they mustn't have owned
V-ing perfect
I mustn't have been owning you mustn't have been owning she mustn't have been owning we mustn't have been owning you mustn't have been owning they mustn't have been owning
Interrogative form
Simple form
must I own? must you own? must she own? must we own? must you own? must they own?
V-ing form
must I be owning? must you be owning? must she be owning? must we be owning? must you be owning? must they be owning?
Perfect
must I have owned? must you have owned? must she have owned? must we have owned? must you have owned? must they have owned?
V-ing perfect
must I have been owning? must you have been owning? must she have been owning? must we have been owning? must you have been owning? must they have been owning?
Interro-negative form
Simple form
mustn't I own? mustn't you own? mustn't she own? mustn't we own? mustn't you own? mustn't they own?
V-ing form
mustn't I be owning? mustn't you be owning? mustn't she be owning? mustn't we be owning? mustn't you be owning? mustn't they be owning?
Perfect
mustn't I have owned? mustn't you have owned? mustn't she have owned? mustn't we have owned? mustn't you have owned? mustn't they have owned?
V-ing perfect
mustn't I have been owning? mustn't you have been owning? mustn't she have been owning? mustn't we have been owning? mustn't you have been owning? mustn't they have been owning?