I could demineralise you could demineralise he could demineralise we could demineralise you could demineralise they could demineralise
V-ing form
I could be demineralising you could be demineralising he could be demineralising we could be demineralising you could be demineralising they could be demineralising
Perfect
I could have demineralised you could have demineralised he could have demineralised we could have demineralised you could have demineralised they could have demineralised
V-ing perfect
I could have been demineralising you could have been demineralising he could have been demineralising we could have been demineralising you could have been demineralising they could have been demineralising
Negation
Simple form
I couldn't demineralise you couldn't demineralise he couldn't demineralise we couldn't demineralise you couldn't demineralise they couldn't demineralise
V-ing form
I couldn't be demineralising you couldn't be demineralising he couldn't be demineralising we couldn't be demineralising you couldn't be demineralising they couldn't be demineralising
Perfect
I couldn't have demineralised you couldn't have demineralised he couldn't have demineralised we couldn't have demineralised you couldn't have demineralised they couldn't have demineralised
V-ing perfect
I couldn't have been demineralising you couldn't have been demineralising he couldn't have been demineralising we couldn't have been demineralising you couldn't have been demineralising they couldn't have been demineralising
Interrogative form
Simple form
could I demineralise? could you demineralise? could he demineralise? could we demineralise? could you demineralise? could they demineralise?
V-ing form
could I be demineralising? could you be demineralising? could he be demineralising? could we be demineralising? could you be demineralising? could they be demineralising?
Perfect
could I have demineralised? could you have demineralised? could he have demineralised? could we have demineralised? could you have demineralised? could they have demineralised?
V-ing perfect
could I have been demineralising? could you have been demineralising? could he have been demineralising? could we have been demineralising? could you have been demineralising? could they have been demineralising?
Interro-negative form
Simple form
couldn't I demineralise? couldn't you demineralise? couldn't he demineralise? couldn't we demineralise? couldn't you demineralise? couldn't they demineralise?
V-ing form
couldn't I be demineralising? couldn't you be demineralising? couldn't he be demineralising? couldn't we be demineralising? couldn't you be demineralising? couldn't they be demineralising?
Perfect
couldn't I have demineralised? couldn't you have demineralised? couldn't he have demineralised? couldn't we have demineralised? couldn't you have demineralised? couldn't they have demineralised?
V-ing perfect
couldn't I have been demineralising? couldn't you have been demineralising? couldn't he have been demineralising? couldn't we have been demineralising? couldn't you have been demineralising? couldn't they have been demineralising?