English verb conjugation
COULD PROFFER

Regular verb: proffer - proffered - proffered

Affirmation

Simple form	V-ing form
I could proffer you could proffer she could proffer we could proffer you could proffer they could proffer	I could be proffering you could be proffering she 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 she 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 she 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 couldn't proffer you couldn't proffer she couldn't proffer we couldn't proffer you couldn't proffer they couldn't proffer	I couldn't be proffering you couldn't be proffering she couldn't be proffering we couldn't be proffering you couldn't be proffering they couldn't be proffering
Perfect	V-ing perfect
I couldn't have proffered you couldn't have proffered she couldn't have proffered we couldn't have proffered you couldn't have proffered they couldn't have proffered	I couldn't have been proffering you couldn't have been proffering she couldn't have been proffering we couldn't have been proffering you couldn't have been proffering they couldn't have been proffering

Interrogative form

Simple form	V-ing form
could I proffer? could you proffer? could she proffer? could we proffer? could you proffer? could they proffer?	could I be proffering? could you be proffering? could she 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 she 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 she 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
couldn't I proffer? couldn't you proffer? couldn't she proffer? couldn't we proffer? couldn't you proffer? couldn't they proffer?	couldn't I be proffering? couldn't you be proffering? couldn't she be proffering? couldn't we be proffering? couldn't you be proffering? couldn't they be proffering?
Perfect	V-ing perfect
couldn't I have proffered? couldn't you have proffered? couldn't she have proffered? couldn't we have proffered? couldn't you have proffered? couldn't they have proffered?	couldn't I have been proffering? couldn't you have been proffering? couldn't she have been proffering? couldn't we have been proffering? couldn't you have been proffering? couldn't they have been proffering?