I could cite you could cite she could cite we could cite you could cite they could cite
V-ing form
I could be citing you could be citing she could be citing we could be citing you could be citing they could be citing
Perfect
I could have cited you could have cited she could have cited we could have cited you could have cited they could have cited
V-ing perfect
I could have been citing you could have been citing she could have been citing we could have been citing you could have been citing they could have been citing
Negation
Simple form
I could not cite you could not cite she could not cite we could not cite you could not cite they could not cite
V-ing form
I could not be citing you could not be citing she could not be citing we could not be citing you could not be citing they could not be citing
Perfect
I could not have cited you could not have cited she could not have cited we could not have cited you could not have cited they could not have cited
V-ing perfect
I could not have been citing you could not have been citing she could not have been citing we could not have been citing you could not have been citing they could not have been citing
Interrogative form
Simple form
could I cite? could you cite? could she cite? could we cite? could you cite? could they cite?
V-ing form
could I be citing? could you be citing? could she be citing? could we be citing? could you be citing? could they be citing?
Perfect
could I have cited? could you have cited? could she have cited? could we have cited? could you have cited? could they have cited?
V-ing perfect
could I have been citing? could you have been citing? could she have been citing? could we have been citing? could you have been citing? could they have been citing?
Interro-negative form
Simple form
could I not cite? could you not cite? could she not cite? could we not cite? could you not cite? could they not cite?
V-ing form
could I not be citing? could you not be citing? could she not be citing? could we not be citing? could you not be citing? could they not be citing?
Perfect
could I not have cited? could you not have cited? could she not have cited? could we not have cited? could you not have cited? could they not have cited?
V-ing perfect
could I not have been citing? could you not have been citing? could she not have been citing? could we not have been citing? could you not have been citing? could they not have been citing?