can tether
Regular verb: tether - tethered- tethered

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot tether
you cannot tether
she cannot tether
we cannot tether
you cannot tether
they cannot tether 	I cannot be tethering
you cannot be tethering
she cannot be tethering
we cannot be tethering
you cannot be tethering
they cannot be tethering	I cannot have tethered
you cannot have tethered
she cannot have tethered
we cannot have tethered
you cannot have tethered
they cannot have tethered	I cannot have been tethering
you cannot have been tethering
she cannot have been tethering
we cannot have been tethering
you cannot have been tethering
they cannot have been tethering	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not tether?
can you not tether?
can she not tether?
can we not tether?
can you not tether?
can they not tether? 	can I not be tethering?
can you not be tethering?
can she not be tethering?
can we not be tethering?
can you not be tethering?
can they not be tethering? 	can I not have tethered?
can you not have tethered?
can she not have tethered?
can we not have tethered?
can you not have tethered?
can they not have tethered? 	can I not have been tethering?
can you not have been tethering?
can she not have been tethering?
can we not have been tethering?
can you not have been tethering?
can they not have been tethering?