I must run you must run he must run we must run you must run they must run
V-ing form
I must be running you must be running he must be running we must be running you must be running they must be running
Perfect
I must have run you must have run he must have run we must have run you must have run they must have run
V-ing perfect
I must have been running you must have been running he must have been running we must have been running you must have been running they must have been running
Negation
Simple form
I must not run you must not run he must not run we must not run you must not run they must not run
V-ing form
I must not be running you must not be running he must not be running we must not be running you must not be running they must not be running
Perfect
I must not have run you must not have run he must not have run we must not have run you must not have run they must not have run
V-ing perfect
I must not have been running you must not have been running he must not have been running we must not have been running you must not have been running they must not have been running
Interrogative form
Simple form
must I run? must you run? must he run? must we run? must you run? must they run?
V-ing form
must I be running? must you be running? must he be running? must we be running? must you be running? must they be running?
Perfect
must I have run? must you have run? must he have run? must we have run? must you have run? must they have run?
V-ing perfect
must I have been running? must you have been running? must he have been running? must we have been running? must you have been running? must they have been running?
Interro-negative form
Simple form
must I not run? must you not run? must he not run? must we not run? must you not run? must they not run?
V-ing form
must I not be running? must you not be running? must he not be running? must we not be running? must you not be running? must they not be running?
Perfect
must I not have run? must you not have run? must he not have run? must we not have run? must you not have run? must they not have run?
V-ing perfect
must I not have been running? must you not have been running? must he not have been running? must we not have been running? must you not have been running? must they not have been running?