I can tether you can tether he can tether we can tether you can tether they can tether
V-ing form
I can be tethering you can be tethering he can be tethering we can be tethering you can be tethering they can be tethering
Perfect
I can have tethered you can have tethered he 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 he 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 he 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 he 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 he 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 he 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 he tether? can we tether? can you tether? can they tether?
V-ing form
can I be tethering? can you be tethering? can he be tethering? can we be tethering? can you be tethering? can they be tethering?
Perfect
can I have tethered? can you have tethered? can he 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 he 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 he 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 he 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 he 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 he have been tethering? can't we have been tethering? can't you have been tethering? can't they have been tethering?