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 mustn't demineralise you mustn't demineralise he mustn't demineralise we mustn't demineralise you mustn't demineralise they mustn't demineralise
V-ing form
I mustn't be demineralising you mustn't be demineralising he mustn't be demineralising we mustn't be demineralising you mustn't be demineralising they mustn't be demineralising
Perfect
I mustn't have demineralised you mustn't have demineralised he mustn't have demineralised we mustn't have demineralised you mustn't have demineralised they mustn't have demineralised
V-ing perfect
I mustn't have been demineralising you mustn't have been demineralising he mustn't have been demineralising we mustn't have been demineralising you mustn't have been demineralising they mustn't 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
mustn't I demineralise? mustn't you demineralise? mustn't he demineralise? mustn't we demineralise? mustn't you demineralise? mustn't they demineralise?
V-ing form
mustn't I be demineralising? mustn't you be demineralising? mustn't he be demineralising? mustn't we be demineralising? mustn't you be demineralising? mustn't they be demineralising?
Perfect
mustn't I have demineralised? mustn't you have demineralised? mustn't he have demineralised? mustn't we have demineralised? mustn't you have demineralised? mustn't they have demineralised?
V-ing perfect
mustn't I have been demineralising? mustn't you have been demineralising? mustn't he have been demineralising? mustn't we have been demineralising? mustn't you have been demineralising? mustn't they have been demineralising?