I could slap you could slap he could slap we could slap you could slap they could slap
V-ing form
I could be slapping you could be slapping he could be slapping we could be slapping you could be slapping they could be slapping
Perfect
I could have slapped you could have slapped he could have slapped we could have slapped you could have slapped they could have slapped
V-ing perfect
I could have been slapping you could have been slapping he could have been slapping we could have been slapping you could have been slapping they could have been slapping
Negation
Simple form
I could not slap you could not slap he could not slap we could not slap you could not slap they could not slap
V-ing form
I could not be slapping you could not be slapping he could not be slapping we could not be slapping you could not be slapping they could not be slapping
Perfect
I could not have slapped you could not have slapped he could not have slapped we could not have slapped you could not have slapped they could not have slapped
V-ing perfect
I could not have been slapping you could not have been slapping he could not have been slapping we could not have been slapping you could not have been slapping they could not have been slapping
Interrogative form
Simple form
could I slap? could you slap? could he slap? could we slap? could you slap? could they slap?
V-ing form
could I be slapping? could you be slapping? could he be slapping? could we be slapping? could you be slapping? could they be slapping?
Perfect
could I have slapped? could you have slapped? could he have slapped? could we have slapped? could you have slapped? could they have slapped?
V-ing perfect
could I have been slapping? could you have been slapping? could he have been slapping? could we have been slapping? could you have been slapping? could they have been slapping?
Interro-negative form
Simple form
could I not slap? could you not slap? could he not slap? could we not slap? could you not slap? could they not slap?
V-ing form
could I not be slapping? could you not be slapping? could he not be slapping? could we not be slapping? could you not be slapping? could they not be slapping?
Perfect
could I not have slapped? could you not have slapped? could he not have slapped? could we not have slapped? could you not have slapped? could they not have slapped?
V-ing perfect
could I not have been slapping? could you not have been slapping? could he not have been slapping? could we not have been slapping? could you not have been slapping? could they not have been slapping?