Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could borrow borrow you could borrow borrow he could borrow borrow we could borrow borrow you could borrow borrow they could borrow borrow
V-ing form
I could be borrow borrowing you could be borrow borrowing he could be borrow borrowing we could be borrow borrowing you could be borrow borrowing they could be borrow borrowing
Perfect
I could have borrow borrowed you could have borrow borrowed he could have borrow borrowed we could have borrow borrowed you could have borrow borrowed they could have borrow borrowed
V-ing perfect
I could have been borrow borrowing you could have been borrow borrowing he could have been borrow borrowing we could have been borrow borrowing you could have been borrow borrowing they could have been borrow borrowing
Negation
Simple form
I could not borrow borrow you could not borrow borrow he could not borrow borrow we could not borrow borrow you could not borrow borrow they could not borrow borrow
V-ing form
I could not be borrow borrowing you could not be borrow borrowing he could not be borrow borrowing we could not be borrow borrowing you could not be borrow borrowing they could not be borrow borrowing
Perfect
I could not have borrow borrowed you could not have borrow borrowed he could not have borrow borrowed we could not have borrow borrowed you could not have borrow borrowed they could not have borrow borrowed
V-ing perfect
I could not have been borrow borrowing you could not have been borrow borrowing he could not have been borrow borrowing we could not have been borrow borrowing you could not have been borrow borrowing they could not have been borrow borrowing
Interrogative form
Simple form
could I borrow borrow? could you borrow borrow? could he borrow borrow? could we borrow borrow? could you borrow borrow? could they borrow borrow?
V-ing form
could I be borrow borrowing? could you be borrow borrowing? could he be borrow borrowing? could we be borrow borrowing? could you be borrow borrowing? could they be borrow borrowing?
Perfect
could I have borrow borrowed? could you have borrow borrowed? could he have borrow borrowed? could we have borrow borrowed? could you have borrow borrowed? could they have borrow borrowed?
V-ing perfect
could I have been borrow borrowing? could you have been borrow borrowing? could he have been borrow borrowing? could we have been borrow borrowing? could you have been borrow borrowing? could they have been borrow borrowing?
Interro-negative form
Simple form
could I not borrow borrow? could you not borrow borrow? could he not borrow borrow? could we not borrow borrow? could you not borrow borrow? could they not borrow borrow?
V-ing form
could I not be borrow borrowing? could you not be borrow borrowing? could he not be borrow borrowing? could we not be borrow borrowing? could you not be borrow borrowing? could they not be borrow borrowing?
Perfect
could I not have borrow borrowed? could you not have borrow borrowed? could he not have borrow borrowed? could we not have borrow borrowed? could you not have borrow borrowed? could they not have borrow borrowed?
V-ing perfect
could I not have been borrow borrowing? could you not have been borrow borrowing? could he not have been borrow borrowing? could we not have been borrow borrowing? could you not have been borrow borrowing? could they not have been borrow borrowing?