I could reign you could reign she could reign we could reign you could reign they could reign
V-ing form
I could be reigning you could be reigning she could be reigning we could be reigning you could be reigning they could be reigning
Perfect
I could have reigned you could have reigned she could have reigned we could have reigned you could have reigned they could have reigned
V-ing perfect
I could have been reigning you could have been reigning she could have been reigning we could have been reigning you could have been reigning they could have been reigning
Negation
Simple form
I could not reign you could not reign she could not reign we could not reign you could not reign they could not reign
V-ing form
I could not be reigning you could not be reigning she could not be reigning we could not be reigning you could not be reigning they could not be reigning
Perfect
I could not have reigned you could not have reigned she could not have reigned we could not have reigned you could not have reigned they could not have reigned
V-ing perfect
I could not have been reigning you could not have been reigning she could not have been reigning we could not have been reigning you could not have been reigning they could not have been reigning
Interrogative form
Simple form
could I reign? could you reign? could she reign? could we reign? could you reign? could they reign?
V-ing form
could I be reigning? could you be reigning? could she be reigning? could we be reigning? could you be reigning? could they be reigning?
Perfect
could I have reigned? could you have reigned? could she have reigned? could we have reigned? could you have reigned? could they have reigned?
V-ing perfect
could I have been reigning? could you have been reigning? could she have been reigning? could we have been reigning? could you have been reigning? could they have been reigning?
Interro-negative form
Simple form
could I not reign? could you not reign? could she not reign? could we not reign? could you not reign? could they not reign?
V-ing form
could I not be reigning? could you not be reigning? could she not be reigning? could we not be reigning? could you not be reigning? could they not be reigning?
Perfect
could I not have reigned? could you not have reigned? could she not have reigned? could we not have reigned? could you not have reigned? could they not have reigned?
V-ing perfect
could I not have been reigning? could you not have been reigning? could she not have been reigning? could we not have been reigning? could you not have been reigning? could they not have been reigning?