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