could sober
Regular verb: sober - sobered- sobered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sober
you could sober
he could sober
we could sober
you could sober
they could sober 	I could be sobering
you could be sobering
he could be sobering
we could be sobering
you could be sobering
they could be sobering	I could have sobered
you could have sobered
he could have sobered
we could have sobered
you could have sobered
they could have sobered	I could have been sobering
you could have been sobering
he could have been sobering
we could have been sobering
you could have been sobering
they could have been sobering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't sober
you couldn't sober
he couldn't sober
we couldn't sober
you couldn't sober
they couldn't sober 	I couldn't be sobering
you couldn't be sobering
he couldn't be sobering
we couldn't be sobering
you couldn't be sobering
they couldn't be sobering	I couldn't have sobered
you couldn't have sobered
he couldn't have sobered
we couldn't have sobered
you couldn't have sobered
they couldn't have sobered	I couldn't have been sobering
you couldn't have been sobering
he couldn't have been sobering
we couldn't have been sobering
you couldn't have been sobering
they couldn't have been sobering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sober?
could you sober?
could he sober?
could we sober?
could you sober?
could they sober? 	could I be sobering?
could you be sobering?
could he be sobering?
could we be sobering?
could you be sobering?
could they be sobering? 	could I have sobered?
could you have sobered?
could he have sobered?
could we have sobered?
could you have sobered?
could they have sobered? 	could I have been sobering?
could you have been sobering?
could he have been sobering?
could we have been sobering?
could you have been sobering?
could they have been sobering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sober?
couldn't you sober?
couldn't he sober?
couldn't we sober?
couldn't you sober?
couldn't they sober? 	couldn't I be sobering?
couldn't you be sobering?
couldn't he be sobering?
couldn't we be sobering?
couldn't you be sobering?
couldn't they be sobering? 	couldn't I have sobered?
couldn't you have sobered?
couldn't he have sobered?
couldn't we have sobered?
couldn't you have sobered?
couldn't they have sobered? 	couldn't I have been sobering?
couldn't you have been sobering?
couldn't he have been sobering?
couldn't we have been sobering?
couldn't you have been sobering?
couldn't they have been sobering?