English verb conjugation
COULD CIRCUMSCRIBE

Regular verb: circumscribe - circumscribed - circumscribed

Affirmation

Simple form	V-ing form
I could circumscribe you could circumscribe he could circumscribe we could circumscribe you could circumscribe they could circumscribe	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
could I circumscribe? could you circumscribe? could he circumscribe? could we circumscribe? could you circumscribe? could they circumscribe?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?