I could poo you could poo he could poo we could poo you could poo they could poo
V-ing form
I could be pooing you could be pooing he could be pooing we could be pooing you could be pooing they could be pooing
Perfect
I could have pooed you could have pooed he could have pooed we could have pooed you could have pooed they could have pooed
V-ing perfect
I could have been pooing you could have been pooing he could have been pooing we could have been pooing you could have been pooing they could have been pooing
Negation
Simple form
I could not poo you could not poo he could not poo we could not poo you could not poo they could not poo
V-ing form
I could not be pooing you could not be pooing he could not be pooing we could not be pooing you could not be pooing they could not be pooing
Perfect
I could not have pooed you could not have pooed he could not have pooed we could not have pooed you could not have pooed they could not have pooed
V-ing perfect
I could not have been pooing you could not have been pooing he could not have been pooing we could not have been pooing you could not have been pooing they could not have been pooing
Interrogative form
Simple form
could I poo? could you poo? could he poo? could we poo? could you poo? could they poo?
V-ing form
could I be pooing? could you be pooing? could he be pooing? could we be pooing? could you be pooing? could they be pooing?
Perfect
could I have pooed? could you have pooed? could he have pooed? could we have pooed? could you have pooed? could they have pooed?
V-ing perfect
could I have been pooing? could you have been pooing? could he have been pooing? could we have been pooing? could you have been pooing? could they have been pooing?
Interro-negative form
Simple form
could I not poo? could you not poo? could he not poo? could we not poo? could you not poo? could they not poo?
V-ing form
could I not be pooing? could you not be pooing? could he not be pooing? could we not be pooing? could you not be pooing? could they not be pooing?
Perfect
could I not have pooed? could you not have pooed? could he not have pooed? could we not have pooed? could you not have pooed? could they not have pooed?
V-ing perfect
could I not have been pooing? could you not have been pooing? could he not have been pooing? could we not have been pooing? could you not have been pooing? could they not have been pooing?