English verb conjugation
COULD PROFFER

Regular verb: proffer - proffered - proffered

Affirmation

Simple form	V-ing form
I could proffer you could proffer he could proffer we could proffer you could proffer they could proffer	I could be proffering you could be proffering he could be proffering we could be proffering you could be proffering they could be proffering
Perfect	V-ing perfect
I could have proffered you could have proffered he could have proffered we could have proffered you could have proffered they could have proffered	I could have been proffering you could have been proffering he could have been proffering we could have been proffering you could have been proffering they could have been proffering

Negation

Simple form	V-ing form
I could not proffer you could not proffer he could not proffer we could not proffer you could not proffer they could not proffer	I could not be proffering you could not be proffering he could not be proffering we could not be proffering you could not be proffering they could not be proffering
Perfect	V-ing perfect
I could not have proffered you could not have proffered he could not have proffered we could not have proffered you could not have proffered they could not have proffered	I could not have been proffering you could not have been proffering he could not have been proffering we could not have been proffering you could not have been proffering they could not have been proffering

Interrogative form

Simple form	V-ing form
could I proffer? could you proffer? could he proffer? could we proffer? could you proffer? could they proffer?	could I be proffering? could you be proffering? could he be proffering? could we be proffering? could you be proffering? could they be proffering?
Perfect	V-ing perfect
could I have proffered? could you have proffered? could he have proffered? could we have proffered? could you have proffered? could they have proffered?	could I have been proffering? could you have been proffering? could he have been proffering? could we have been proffering? could you have been proffering? could they have been proffering?

Interro-negative form

Simple form	V-ing form
could I not proffer? could you not proffer? could he not proffer? could we not proffer? could you not proffer? could they not proffer?	could I not be proffering? could you not be proffering? could he not be proffering? could we not be proffering? could you not be proffering? could they not be proffering?
Perfect	V-ing perfect
could I not have proffered? could you not have proffered? could he not have proffered? could we not have proffered? could you not have proffered? could they not have proffered?	could I not have been proffering? could you not have been proffering? could he not have been proffering? could we not have been proffering? could you not have been proffering? could they not have been proffering?