I must salt you must salt she must salt we must salt you must salt they must salt
V-ing form
I must be salting you must be salting she must be salting we must be salting you must be salting they must be salting
Perfect
I must have salted you must have salted she 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 she 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 she 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 she 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 she 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 she 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 she salt? must we salt? must you salt? must they salt?
V-ing form
must I be salting? must you be salting? must she be salting? must we be salting? must you be salting? must they be salting?
Perfect
must I have salted? must you have salted? must she 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 she 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 she 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 she 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 she 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 she have been salting? mustn't we have been salting? mustn't you have been salting? mustn't they have been salting?