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