I could annul you could annul she could annul we could annul you could annul they could annul
V-ing form
I could be annulling you could be annulling she could be annulling we could be annulling you could be annulling they could be annulling
Perfect
I could have annulled you could have annulled she 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 she 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 she 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 she 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 she 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 she 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 she annul? could we annul? could you annul? could they annul?
V-ing form
could I be annulling? could you be annulling? could she be annulling? could we be annulling? could you be annulling? could they be annulling?
Perfect
could I have annulled? could you have annulled? could she 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 she 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 she 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 she 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 she 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 she have been annulling? couldn't we have been annulling? couldn't you have been annulling? couldn't they have been annulling?