I could ascribe you could ascribe she could ascribe we could ascribe you could ascribe they could ascribe
V-ing form
I could be ascribing you could be ascribing she could be ascribing we could be ascribing you could be ascribing they could be ascribing
Perfect
I could have ascribed you could have ascribed she could have ascribed we could have ascribed you could have ascribed they could have ascribed
V-ing perfect
I could have been ascribing you could have been ascribing she could have been ascribing we could have been ascribing you could have been ascribing they could have been ascribing
Negation
Simple form
I could not ascribe you could not ascribe she could not ascribe we could not ascribe you could not ascribe they could not ascribe
V-ing form
I could not be ascribing you could not be ascribing she could not be ascribing we could not be ascribing you could not be ascribing they could not be ascribing
Perfect
I could not have ascribed you could not have ascribed she could not have ascribed we could not have ascribed you could not have ascribed they could not have ascribed
V-ing perfect
I could not have been ascribing you could not have been ascribing she could not have been ascribing we could not have been ascribing you could not have been ascribing they could not have been ascribing
Interrogative form
Simple form
could I ascribe? could you ascribe? could she ascribe? could we ascribe? could you ascribe? could they ascribe?
V-ing form
could I be ascribing? could you be ascribing? could she be ascribing? could we be ascribing? could you be ascribing? could they be ascribing?
Perfect
could I have ascribed? could you have ascribed? could she have ascribed? could we have ascribed? could you have ascribed? could they have ascribed?
V-ing perfect
could I have been ascribing? could you have been ascribing? could she have been ascribing? could we have been ascribing? could you have been ascribing? could they have been ascribing?
Interro-negative form
Simple form
could I not ascribe? could you not ascribe? could she not ascribe? could we not ascribe? could you not ascribe? could they not ascribe?
V-ing form
could I not be ascribing? could you not be ascribing? could she not be ascribing? could we not be ascribing? could you not be ascribing? could they not be ascribing?
Perfect
could I not have ascribed? could you not have ascribed? could she not have ascribed? could we not have ascribed? could you not have ascribed? could they not have ascribed?
V-ing perfect
could I not have been ascribing? could you not have been ascribing? could she not have been ascribing? could we not have been ascribing? could you not have been ascribing? could they not have been ascribing?