I could reign you could reign he could reign we could reign you could reign they could reign
V-ing form
I could be reigning you could be reigning he could be reigning we could be reigning you could be reigning they could be reigning
Perfect
I could have reigned you could have reigned he 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 he could have been reigning we could have been reigning you could have been reigning they could have been reigning
Negation
Simple form
I couldn't reign you couldn't reign he couldn't reign we couldn't reign you couldn't reign they couldn't reign
V-ing form
I couldn't be reigning you couldn't be reigning he couldn't be reigning we couldn't be reigning you couldn't be reigning they couldn't be reigning
Perfect
I couldn't have reigned you couldn't have reigned he couldn't have reigned we couldn't have reigned you couldn't have reigned they couldn't have reigned
V-ing perfect
I couldn't have been reigning you couldn't have been reigning he couldn't have been reigning we couldn't have been reigning you couldn't have been reigning they couldn't have been reigning
Interrogative form
Simple form
could I reign? could you reign? could he reign? could we reign? could you reign? could they reign?
V-ing form
could I be reigning? could you be reigning? could he be reigning? could we be reigning? could you be reigning? could they be reigning?
Perfect
could I have reigned? could you have reigned? could he 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 he have been reigning? could we have been reigning? could you have been reigning? could they have been reigning?
Interro-negative form
Simple form
couldn't I reign? couldn't you reign? couldn't he reign? couldn't we reign? couldn't you reign? couldn't they reign?
V-ing form
couldn't I be reigning? couldn't you be reigning? couldn't he be reigning? couldn't we be reigning? couldn't you be reigning? couldn't they be reigning?
Perfect
couldn't I have reigned? couldn't you have reigned? couldn't he have reigned? couldn't we have reigned? couldn't you have reigned? couldn't they have reigned?
V-ing perfect
couldn't I have been reigning? couldn't you have been reigning? couldn't he have been reigning? couldn't we have been reigning? couldn't you have been reigning? couldn't they have been reigning?