can proffer
Regular verb: proffer - proffered- proffered

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