English verb conjugation
COULD RAVEN

Regular verb: raven - ravened - ravened

Affirmation

Simple form	V-ing form
I could raven you could raven he could raven we could raven you could raven they could raven	I could be ravening you could be ravening he could be ravening we could be ravening you could be ravening they could be ravening
Perfect	V-ing perfect
I could have ravened you could have ravened he could have ravened we could have ravened you could have ravened they could have ravened	I could have been ravening you could have been ravening he could have been ravening we could have been ravening you could have been ravening they could have been ravening

Negation

Simple form	V-ing form
I could not raven you could not raven he could not raven we could not raven you could not raven they could not raven	I could not be ravening you could not be ravening he could not be ravening we could not be ravening you could not be ravening they could not be ravening
Perfect	V-ing perfect
I could not have ravened you could not have ravened he could not have ravened we could not have ravened you could not have ravened they could not have ravened	I could not have been ravening you could not have been ravening he could not have been ravening we could not have been ravening you could not have been ravening they could not have been ravening

Interrogative form

Simple form	V-ing form
could I raven? could you raven? could he raven? could we raven? could you raven? could they raven?	could I be ravening? could you be ravening? could he be ravening? could we be ravening? could you be ravening? could they be ravening?
Perfect	V-ing perfect
could I have ravened? could you have ravened? could he have ravened? could we have ravened? could you have ravened? could they have ravened?	could I have been ravening? could you have been ravening? could he have been ravening? could we have been ravening? could you have been ravening? could they have been ravening?

Interro-negative form

Simple form	V-ing form
could I not raven? could you not raven? could he not raven? could we not raven? could you not raven? could they not raven?	could I not be ravening? could you not be ravening? could he not be ravening? could we not be ravening? could you not be ravening? could they not be ravening?
Perfect	V-ing perfect
could I not have ravened? could you not have ravened? could he not have ravened? could we not have ravened? could you not have ravened? could they not have ravened?	could I not have been ravening? could you not have been ravening? could he not have been ravening? could we not have been ravening? could you not have been ravening? could they not have been ravening?