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