I could slay you could slay he could slay we could slay you could slay they could slay
V-ing form
I could be slaying you could be slaying he could be slaying we could be slaying you could be slaying they could be slaying
Perfect
I could have slain you could have slain he could have slain we could have slain you could have slain they could have slain
V-ing perfect
I could have been slaying you could have been slaying he could have been slaying we could have been slaying you could have been slaying they could have been slaying
Negation
Simple form
I couldn't slay you couldn't slay he couldn't slay we couldn't slay you couldn't slay they couldn't slay
V-ing form
I couldn't be slaying you couldn't be slaying he couldn't be slaying we couldn't be slaying you couldn't be slaying they couldn't be slaying
Perfect
I couldn't have slain you couldn't have slain he couldn't have slain we couldn't have slain you couldn't have slain they couldn't have slain
V-ing perfect
I couldn't have been slaying you couldn't have been slaying he couldn't have been slaying we couldn't have been slaying you couldn't have been slaying they couldn't have been slaying
Interrogative form
Simple form
could I slay? could you slay? could he slay? could we slay? could you slay? could they slay?
V-ing form
could I be slaying? could you be slaying? could he be slaying? could we be slaying? could you be slaying? could they be slaying?
Perfect
could I have slain? could you have slain? could he have slain? could we have slain? could you have slain? could they have slain?
V-ing perfect
could I have been slaying? could you have been slaying? could he have been slaying? could we have been slaying? could you have been slaying? could they have been slaying?
Interro-negative form
Simple form
couldn't I slay? couldn't you slay? couldn't he slay? couldn't we slay? couldn't you slay? couldn't they slay?
V-ing form
couldn't I be slaying? couldn't you be slaying? couldn't he be slaying? couldn't we be slaying? couldn't you be slaying? couldn't they be slaying?
Perfect
couldn't I have slain? couldn't you have slain? couldn't he have slain? couldn't we have slain? couldn't you have slain? couldn't they have slain?
V-ing perfect
couldn't I have been slaying? couldn't you have been slaying? couldn't he have been slaying? couldn't we have been slaying? couldn't you have been slaying? couldn't they have been slaying?