I could order you could order she could order we could order you could order they could order
V-ing form
I could be ordering you could be ordering she could be ordering we could be ordering you could be ordering they could be ordering
Perfect
I could have ordered you could have ordered she could have ordered we could have ordered you could have ordered they could have ordered
V-ing perfect
I could have been ordering you could have been ordering she could have been ordering we could have been ordering you could have been ordering they could have been ordering
Negation
Simple form
I could not order you could not order she could not order we could not order you could not order they could not order
V-ing form
I could not be ordering you could not be ordering she could not be ordering we could not be ordering you could not be ordering they could not be ordering
Perfect
I could not have ordered you could not have ordered she could not have ordered we could not have ordered you could not have ordered they could not have ordered
V-ing perfect
I could not have been ordering you could not have been ordering she could not have been ordering we could not have been ordering you could not have been ordering they could not have been ordering
Interrogative form
Simple form
could I order? could you order? could she order? could we order? could you order? could they order?
V-ing form
could I be ordering? could you be ordering? could she be ordering? could we be ordering? could you be ordering? could they be ordering?
Perfect
could I have ordered? could you have ordered? could she have ordered? could we have ordered? could you have ordered? could they have ordered?
V-ing perfect
could I have been ordering? could you have been ordering? could she have been ordering? could we have been ordering? could you have been ordering? could they have been ordering?
Interro-negative form
Simple form
could I not order? could you not order? could she not order? could we not order? could you not order? could they not order?
V-ing form
could I not be ordering? could you not be ordering? could she not be ordering? could we not be ordering? could you not be ordering? could they not be ordering?
Perfect
could I not have ordered? could you not have ordered? could she not have ordered? could we not have ordered? could you not have ordered? could they not have ordered?
V-ing perfect
could I not have been ordering? could you not have been ordering? could she not have been ordering? could we not have been ordering? could you not have been ordering? could they not have been ordering?