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