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