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