English verb conjugation
CAN PROFFER

Regular verb: proffer - proffered - proffered

Affirmation

Simple form	V-ing form
I can proffer you can proffer he can proffer we can proffer you can proffer they can proffer	I can be proffering you can be proffering he 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 he 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 he 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 can't proffer you can't proffer he can't proffer we can't proffer you can't proffer they can't proffer	I can't be proffering you can't be proffering he can't be proffering we can't be proffering you can't be proffering they can't be proffering
Perfect	V-ing perfect
I can't have proffered you can't have proffered he can't have proffered we can't have proffered you can't have proffered they can't have proffered	I can't have been proffering you can't have been proffering he can't have been proffering we can't have been proffering you can't have been proffering they can't have been proffering

Interrogative form

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