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