I can tether you can tether she can tether we can tether you can tether they can tether
V-ing form
I can be tethering you can be tethering she can be tethering we can be tethering you can be tethering they can be tethering
Perfect
I can have tethered you can have tethered she can have tethered we can have tethered you can have tethered they can have tethered
V-ing perfect
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
I can't tether you can't tether she can't tether we can't tether you can't tether they can't tether
V-ing form
I can't be tethering you can't be tethering she can't be tethering we can't be tethering you can't be tethering they can't be tethering
Perfect
I can't have tethered you can't have tethered she can't have tethered we can't have tethered you can't have tethered they can't have tethered
V-ing perfect
I can't have been tethering you can't have been tethering she can't have been tethering we can't have been tethering you can't have been tethering they can't have been tethering
Interrogative form
Simple form
can I tether? can you tether? can she tether? can we tether? can you tether? can they tether?
V-ing form
can I be tethering? can you be tethering? can she be tethering? can we be tethering? can you be tethering? can they be tethering?
Perfect
can I have tethered? can you have tethered? can she have tethered? can we have tethered? can you have tethered? can they have tethered?
V-ing perfect
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
can't I tether? can't you tether? can't she tether? can't we tether? can't you tether? can't they tether?
V-ing form
can't I be tethering? can't you be tethering? can't she be tethering? can't we be tethering? can't you be tethering? can't they be tethering?
Perfect
can't I have tethered? can't you have tethered? can't she have tethered? can't we have tethered? can't you have tethered? can't they have tethered?
V-ing perfect
can't I have been tethering? can't you have been tethering? can't she have been tethering? can't we have been tethering? can't you have been tethering? can't they have been tethering?