I must salt you must salt he must salt we must salt you must salt they must salt
V-ing form
I must be salting you must be salting he must be salting we must be salting you must be salting they must be salting
Perfect
I must have salted you must have salted he must have salted we must have salted you must have salted they must have salted
V-ing perfect
I must have been salting you must have been salting he must have been salting we must have been salting you must have been salting they must have been salting
Negation
Simple form
I mustn't salt you mustn't salt he mustn't salt we mustn't salt you mustn't salt they mustn't salt
V-ing form
I mustn't be salting you mustn't be salting he mustn't be salting we mustn't be salting you mustn't be salting they mustn't be salting
Perfect
I mustn't have salted you mustn't have salted he mustn't have salted we mustn't have salted you mustn't have salted they mustn't have salted
V-ing perfect
I mustn't have been salting you mustn't have been salting he mustn't have been salting we mustn't have been salting you mustn't have been salting they mustn't have been salting
Interrogative form
Simple form
must I salt? must you salt? must he salt? must we salt? must you salt? must they salt?
V-ing form
must I be salting? must you be salting? must he be salting? must we be salting? must you be salting? must they be salting?
Perfect
must I have salted? must you have salted? must he have salted? must we have salted? must you have salted? must they have salted?
V-ing perfect
must I have been salting? must you have been salting? must he have been salting? must we have been salting? must you have been salting? must they have been salting?
Interro-negative form
Simple form
mustn't I salt? mustn't you salt? mustn't he salt? mustn't we salt? mustn't you salt? mustn't they salt?
V-ing form
mustn't I be salting? mustn't you be salting? mustn't he be salting? mustn't we be salting? mustn't you be salting? mustn't they be salting?
Perfect
mustn't I have salted? mustn't you have salted? mustn't he have salted? mustn't we have salted? mustn't you have salted? mustn't they have salted?
V-ing perfect
mustn't I have been salting? mustn't you have been salting? mustn't he have been salting? mustn't we have been salting? mustn't you have been salting? mustn't they have been salting?