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