could chamfer
Regular verb: chamfer - chamfered- chamfered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could chamfer
you could chamfer
she could chamfer
we could chamfer
you could chamfer
they could chamfer 	I could be chamfering
you could be chamfering
she could be chamfering
we could be chamfering
you could be chamfering
they could be chamfering	I could have chamfered
you could have chamfered
she could have chamfered
we could have chamfered
you could have chamfered
they could have chamfered	I could have been chamfering
you could have been chamfering
she could have been chamfering
we could have been chamfering
you could have been chamfering
they could have been chamfering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't chamfer
you couldn't chamfer
she couldn't chamfer
we couldn't chamfer
you couldn't chamfer
they couldn't chamfer 	I couldn't be chamfering
you couldn't be chamfering
she couldn't be chamfering
we couldn't be chamfering
you couldn't be chamfering
they couldn't be chamfering	I couldn't have chamfered
you couldn't have chamfered
she couldn't have chamfered
we couldn't have chamfered
you couldn't have chamfered
they couldn't have chamfered	I couldn't have been chamfering
you couldn't have been chamfering
she couldn't have been chamfering
we couldn't have been chamfering
you couldn't have been chamfering
they couldn't have been chamfering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I chamfer?
could you chamfer?
could she chamfer?
could we chamfer?
could you chamfer?
could they chamfer? 	could I be chamfering?
could you be chamfering?
could she be chamfering?
could we be chamfering?
could you be chamfering?
could they be chamfering? 	could I have chamfered?
could you have chamfered?
could she have chamfered?
could we have chamfered?
could you have chamfered?
could they have chamfered? 	could I have been chamfering?
could you have been chamfering?
could she have been chamfering?
could we have been chamfering?
could you have been chamfering?
could they have been chamfering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I chamfer?
couldn't you chamfer?
couldn't she chamfer?
couldn't we chamfer?
couldn't you chamfer?
couldn't they chamfer? 	couldn't I be chamfering?
couldn't you be chamfering?
couldn't she be chamfering?
couldn't we be chamfering?
couldn't you be chamfering?
couldn't they be chamfering? 	couldn't I have chamfered?
couldn't you have chamfered?
couldn't she have chamfered?
couldn't we have chamfered?
couldn't you have chamfered?
couldn't they have chamfered? 	couldn't I have been chamfering?
couldn't you have been chamfering?
couldn't she have been chamfering?
couldn't we have been chamfering?
couldn't you have been chamfering?
couldn't they have been chamfering?