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