English verb conjugation
COULD TETHER

Regular verb: tether - tethered - tethered

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?