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 must not salt you must not salt he must not salt we must not salt you must not salt they must not salt
V-ing form
I must not be salting you must not be salting he must not be salting we must not be salting you must not be salting they must not be salting
Perfect
I must not have salted you must not have salted he must not have salted we must not have salted you must not have salted they must not have salted
V-ing perfect
I must not have been salting you must not have been salting he must not have been salting we must not have been salting you must not have been salting they must not 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
must I not salt? must you not salt? must he not salt? must we not salt? must you not salt? must they not salt?
V-ing form
must I not be salting? must you not be salting? must he not be salting? must we not be salting? must you not be salting? must they not be salting?
Perfect
must I not have salted? must you not have salted? must he not have salted? must we not have salted? must you not have salted? must they not have salted?
V-ing perfect
must I not have been salting? must you not have been salting? must he not have been salting? must we not have been salting? must you not have been salting? must they not have been salting?