English verb conjugation
CAN PROFFER

Regular verb: proffer - proffered - proffered

Affirmation

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

Negation

Simple form	V-ing form
I cannot proffer you cannot proffer she cannot proffer we cannot proffer you cannot proffer they cannot proffer	I cannot be proffering you cannot be proffering she cannot be proffering we cannot be proffering you cannot be proffering they cannot be proffering
Perfect	V-ing perfect
I cannot have proffered you cannot have proffered she cannot have proffered we cannot have proffered you cannot have proffered they cannot have proffered	I cannot have been proffering you cannot have been proffering she cannot have been proffering we cannot have been proffering you cannot have been proffering they cannot have been proffering

Interrogative form

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

Interro-negative form

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