I could benumb you could benumb she could benumb we could benumb you could benumb they could benumb
V-ing form
I could be benumbing you could be benumbing she could be benumbing we could be benumbing you could be benumbing they could be benumbing
Perfect
I could have benumbed you could have benumbed she could have benumbed we could have benumbed you could have benumbed they could have benumbed
V-ing perfect
I could have been benumbing you could have been benumbing she could have been benumbing we could have been benumbing you could have been benumbing they could have been benumbing
Negation
Simple form
I couldn't benumb you couldn't benumb she couldn't benumb we couldn't benumb you couldn't benumb they couldn't benumb
V-ing form
I couldn't be benumbing you couldn't be benumbing she couldn't be benumbing we couldn't be benumbing you couldn't be benumbing they couldn't be benumbing
Perfect
I couldn't have benumbed you couldn't have benumbed she couldn't have benumbed we couldn't have benumbed you couldn't have benumbed they couldn't have benumbed
V-ing perfect
I couldn't have been benumbing you couldn't have been benumbing she couldn't have been benumbing we couldn't have been benumbing you couldn't have been benumbing they couldn't have been benumbing
Interrogative form
Simple form
could I benumb? could you benumb? could she benumb? could we benumb? could you benumb? could they benumb?
V-ing form
could I be benumbing? could you be benumbing? could she be benumbing? could we be benumbing? could you be benumbing? could they be benumbing?
Perfect
could I have benumbed? could you have benumbed? could she have benumbed? could we have benumbed? could you have benumbed? could they have benumbed?
V-ing perfect
could I have been benumbing? could you have been benumbing? could she have been benumbing? could we have been benumbing? could you have been benumbing? could they have been benumbing?
Interro-negative form
Simple form
couldn't I benumb? couldn't you benumb? couldn't she benumb? couldn't we benumb? couldn't you benumb? couldn't they benumb?
V-ing form
couldn't I be benumbing? couldn't you be benumbing? couldn't she be benumbing? couldn't we be benumbing? couldn't you be benumbing? couldn't they be benumbing?
Perfect
couldn't I have benumbed? couldn't you have benumbed? couldn't she have benumbed? couldn't we have benumbed? couldn't you have benumbed? couldn't they have benumbed?
V-ing perfect
couldn't I have been benumbing? couldn't you have been benumbing? couldn't she have been benumbing? couldn't we have been benumbing? couldn't you have been benumbing? couldn't they have been benumbing?