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