I could pore you could pore he could pore we could pore you could pore they could pore
V-ing form
I could be poring you could be poring he could be poring we could be poring you could be poring they could be poring
Perfect
I could have pored you could have pored he could have pored we could have pored you could have pored they could have pored
V-ing perfect
I could have been poring you could have been poring he could have been poring we could have been poring you could have been poring they could have been poring
Negation
Simple form
I could not pore you could not pore he could not pore we could not pore you could not pore they could not pore
V-ing form
I could not be poring you could not be poring he could not be poring we could not be poring you could not be poring they could not be poring
Perfect
I could not have pored you could not have pored he could not have pored we could not have pored you could not have pored they could not have pored
V-ing perfect
I could not have been poring you could not have been poring he could not have been poring we could not have been poring you could not have been poring they could not have been poring
Interrogative form
Simple form
could I pore? could you pore? could he pore? could we pore? could you pore? could they pore?
V-ing form
could I be poring? could you be poring? could he be poring? could we be poring? could you be poring? could they be poring?
Perfect
could I have pored? could you have pored? could he have pored? could we have pored? could you have pored? could they have pored?
V-ing perfect
could I have been poring? could you have been poring? could he have been poring? could we have been poring? could you have been poring? could they have been poring?
Interro-negative form
Simple form
could I not pore? could you not pore? could he not pore? could we not pore? could you not pore? could they not pore?
V-ing form
could I not be poring? could you not be poring? could he not be poring? could we not be poring? could you not be poring? could they not be poring?
Perfect
could I not have pored? could you not have pored? could he not have pored? could we not have pored? could you not have pored? could they not have pored?
V-ing perfect
could I not have been poring? could you not have been poring? could he not have been poring? could we not have been poring? could you not have been poring? could they not have been poring?