I must demineralise you must demineralise he must demineralise we must demineralise you must demineralise they must demineralise
V-ing form
I must be demineralising you must be demineralising he must be demineralising we must be demineralising you must be demineralising they must be demineralising
Perfect
I must have demineralised you must have demineralised he must have demineralised we must have demineralised you must have demineralised they must have demineralised
V-ing perfect
I must have been demineralising you must have been demineralising he must have been demineralising we must have been demineralising you must have been demineralising they must have been demineralising
Negation
Simple form
I must not demineralise you must not demineralise he must not demineralise we must not demineralise you must not demineralise they must not demineralise
V-ing form
I must not be demineralising you must not be demineralising he must not be demineralising we must not be demineralising you must not be demineralising they must not be demineralising
Perfect
I must not have demineralised you must not have demineralised he must not have demineralised we must not have demineralised you must not have demineralised they must not have demineralised
V-ing perfect
I must not have been demineralising you must not have been demineralising he must not have been demineralising we must not have been demineralising you must not have been demineralising they must not have been demineralising
Interrogative form
Simple form
must I demineralise? must you demineralise? must he demineralise? must we demineralise? must you demineralise? must they demineralise?
V-ing form
must I be demineralising? must you be demineralising? must he be demineralising? must we be demineralising? must you be demineralising? must they be demineralising?
Perfect
must I have demineralised? must you have demineralised? must he have demineralised? must we have demineralised? must you have demineralised? must they have demineralised?
V-ing perfect
must I have been demineralising? must you have been demineralising? must he have been demineralising? must we have been demineralising? must you have been demineralising? must they have been demineralising?
Interro-negative form
Simple form
must I not demineralise? must you not demineralise? must he not demineralise? must we not demineralise? must you not demineralise? must they not demineralise?
V-ing form
must I not be demineralising? must you not be demineralising? must he not be demineralising? must we not be demineralising? must you not be demineralising? must they not be demineralising?
Perfect
must I not have demineralised? must you not have demineralised? must he not have demineralised? must we not have demineralised? must you not have demineralised? must they not have demineralised?
V-ing perfect
must I not have been demineralising? must you not have been demineralising? must he not have been demineralising? must we not have been demineralising? must you not have been demineralising? must they not have been demineralising?