I could value you could value she could value we could value you could value they could value
V-ing form
I could be valuing you could be valuing she could be valuing we could be valuing you could be valuing they could be valuing
Perfect
I could have valued you could have valued she could have valued we could have valued you could have valued they could have valued
V-ing perfect
I could have been valuing you could have been valuing she could have been valuing we could have been valuing you could have been valuing they could have been valuing
Negation
Simple form
I could not value you could not value she could not value we could not value you could not value they could not value
V-ing form
I could not be valuing you could not be valuing she could not be valuing we could not be valuing you could not be valuing they could not be valuing
Perfect
I could not have valued you could not have valued she could not have valued we could not have valued you could not have valued they could not have valued
V-ing perfect
I could not have been valuing you could not have been valuing she could not have been valuing we could not have been valuing you could not have been valuing they could not have been valuing
Interrogative form
Simple form
could I value? could you value? could she value? could we value? could you value? could they value?
V-ing form
could I be valuing? could you be valuing? could she be valuing? could we be valuing? could you be valuing? could they be valuing?
Perfect
could I have valued? could you have valued? could she have valued? could we have valued? could you have valued? could they have valued?
V-ing perfect
could I have been valuing? could you have been valuing? could she have been valuing? could we have been valuing? could you have been valuing? could they have been valuing?
Interro-negative form
Simple form
could I not value? could you not value? could she not value? could we not value? could you not value? could they not value?
V-ing form
could I not be valuing? could you not be valuing? could she not be valuing? could we not be valuing? could you not be valuing? could they not be valuing?
Perfect
could I not have valued? could you not have valued? could she not have valued? could we not have valued? could you not have valued? could they not have valued?
V-ing perfect
could I not have been valuing? could you not have been valuing? could she not have been valuing? could we not have been valuing? could you not have been valuing? could they not have been valuing?