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