could timber
Regular verb: timber - timbered- timbered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could timber
you could timber
she could timber
we could timber
you could timber
they could timber 	I could be timbering
you could be timbering
she could be timbering
we could be timbering
you could be timbering
they could be timbering	I could have timbered
you could have timbered
she could have timbered
we could have timbered
you could have timbered
they could have timbered	I could have been timbering
you could have been timbering
she could have been timbering
we could have been timbering
you could have been timbering
they could have been timbering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't timber
you couldn't timber
she couldn't timber
we couldn't timber
you couldn't timber
they couldn't timber 	I couldn't be timbering
you couldn't be timbering
she couldn't be timbering
we couldn't be timbering
you couldn't be timbering
they couldn't be timbering	I couldn't have timbered
you couldn't have timbered
she couldn't have timbered
we couldn't have timbered
you couldn't have timbered
they couldn't have timbered	I couldn't have been timbering
you couldn't have been timbering
she couldn't have been timbering
we couldn't have been timbering
you couldn't have been timbering
they couldn't have been timbering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I timber?
could you timber?
could she timber?
could we timber?
could you timber?
could they timber? 	could I be timbering?
could you be timbering?
could she be timbering?
could we be timbering?
could you be timbering?
could they be timbering? 	could I have timbered?
could you have timbered?
could she have timbered?
could we have timbered?
could you have timbered?
could they have timbered? 	could I have been timbering?
could you have been timbering?
could she have been timbering?
could we have been timbering?
could you have been timbering?
could they have been timbering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I timber?
couldn't you timber?
couldn't she timber?
couldn't we timber?
couldn't you timber?
couldn't they timber? 	couldn't I be timbering?
couldn't you be timbering?
couldn't she be timbering?
couldn't we be timbering?
couldn't you be timbering?
couldn't they be timbering? 	couldn't I have timbered?
couldn't you have timbered?
couldn't she have timbered?
couldn't we have timbered?
couldn't you have timbered?
couldn't they have timbered? 	couldn't I have been timbering?
couldn't you have been timbering?
couldn't she have been timbering?
couldn't we have been timbering?
couldn't you have been timbering?
couldn't they have been timbering?