I could eat you could eat she could eat we could eat you could eat they could eat
V-ing form
I could be eating you could be eating she could be eating we could be eating you could be eating they could be eating
Perfect
I could have eaten you could have eaten she could have eaten we could have eaten you could have eaten they could have eaten
V-ing perfect
I could have been eating you could have been eating she could have been eating we could have been eating you could have been eating they could have been eating
Negation
Simple form
I could not eat you could not eat she could not eat we could not eat you could not eat they could not eat
V-ing form
I could not be eating you could not be eating she could not be eating we could not be eating you could not be eating they could not be eating
Perfect
I could not have eaten you could not have eaten she could not have eaten we could not have eaten you could not have eaten they could not have eaten
V-ing perfect
I could not have been eating you could not have been eating she could not have been eating we could not have been eating you could not have been eating they could not have been eating
Interrogative form
Simple form
could I eat? could you eat? could she eat? could we eat? could you eat? could they eat?
V-ing form
could I be eating? could you be eating? could she be eating? could we be eating? could you be eating? could they be eating?
Perfect
could I have eaten? could you have eaten? could she have eaten? could we have eaten? could you have eaten? could they have eaten?
V-ing perfect
could I have been eating? could you have been eating? could she have been eating? could we have been eating? could you have been eating? could they have been eating?
Interro-negative form
Simple form
could I not eat? could you not eat? could she not eat? could we not eat? could you not eat? could they not eat?
V-ing form
could I not be eating? could you not be eating? could she not be eating? could we not be eating? could you not be eating? could they not be eating?
Perfect
could I not have eaten? could you not have eaten? could she not have eaten? could we not have eaten? could you not have eaten? could they not have eaten?
V-ing perfect
could I not have been eating? could you not have been eating? could she not have been eating? could we not have been eating? could you not have been eating? could they not have been eating?