could tether
Regular verb: tether - tethered- tethered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tether
you could tether
he could tether
we could tether
you could tether
they could tether 	I could be tethering
you could be tethering
he could be tethering
we could be tethering
you could be tethering
they could be tethering	I could have tethered
you could have tethered
he could have tethered
we could have tethered
you could have tethered
they could have tethered	I could have been tethering
you could have been tethering
he could have been tethering
we could have been tethering
you could have been tethering
they could have been tethering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tether
you couldn't tether
he couldn't tether
we couldn't tether
you couldn't tether
they couldn't tether 	I couldn't be tethering
you couldn't be tethering
he couldn't be tethering
we couldn't be tethering
you couldn't be tethering
they couldn't be tethering	I couldn't have tethered
you couldn't have tethered
he couldn't have tethered
we couldn't have tethered
you couldn't have tethered
they couldn't have tethered	I couldn't have been tethering
you couldn't have been tethering
he couldn't have been tethering
we couldn't have been tethering
you couldn't have been tethering
they couldn't have been tethering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tether?
could you tether?
could he tether?
could we tether?
could you tether?
could they tether? 	could I be tethering?
could you be tethering?
could he be tethering?
could we be tethering?
could you be tethering?
could they be tethering? 	could I have tethered?
could you have tethered?
could he have tethered?
could we have tethered?
could you have tethered?
could they have tethered? 	could I have been tethering?
could you have been tethering?
could he have been tethering?
could we have been tethering?
could you have been tethering?
could they have been tethering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tether?
couldn't you tether?
couldn't he tether?
couldn't we tether?
couldn't you tether?
couldn't they tether? 	couldn't I be tethering?
couldn't you be tethering?
couldn't he be tethering?
couldn't we be tethering?
couldn't you be tethering?
couldn't they be tethering? 	couldn't I have tethered?
couldn't you have tethered?
couldn't he have tethered?
couldn't we have tethered?
couldn't you have tethered?
couldn't they have tethered? 	couldn't I have been tethering?
couldn't you have been tethering?
couldn't he have been tethering?
couldn't we have been tethering?
couldn't you have been tethering?
couldn't they have been tethering?