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