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