English verb conjugation
MUST BORROW

Regular verb: borrow - borrowed - borrowed

Affirmation

Simple form	V-ing form
I must borrow you must borrow he must borrow we must borrow you must borrow they must borrow	I must be borrowing you must be borrowing he must be borrowing we must be borrowing you must be borrowing they must be borrowing
Perfect	V-ing perfect
I must have borrowed you must have borrowed he must have borrowed we must have borrowed you must have borrowed they must have borrowed	I must have been borrowing you must have been borrowing he must have been borrowing we must have been borrowing you must have been borrowing they must have been borrowing

Negation

Simple form	V-ing form
I must not borrow you must not borrow he must not borrow we must not borrow you must not borrow they must not borrow	I must not be borrowing you must not be borrowing he must not be borrowing we must not be borrowing you must not be borrowing they must not be borrowing
Perfect	V-ing perfect
I must not have borrowed you must not have borrowed he must not have borrowed we must not have borrowed you must not have borrowed they must not have borrowed	I must not have been borrowing you must not have been borrowing he must not have been borrowing we must not have been borrowing you must not have been borrowing they must not have been borrowing

Interrogative form

Simple form	V-ing form
must I borrow? must you borrow? must he borrow? must we borrow? must you borrow? must they borrow?	must I be borrowing? must you be borrowing? must he be borrowing? must we be borrowing? must you be borrowing? must they be borrowing?
Perfect	V-ing perfect
must I have borrowed? must you have borrowed? must he have borrowed? must we have borrowed? must you have borrowed? must they have borrowed?	must I have been borrowing? must you have been borrowing? must he have been borrowing? must we have been borrowing? must you have been borrowing? must they have been borrowing?

Interro-negative form

Simple form	V-ing form
must I not borrow? must you not borrow? must he not borrow? must we not borrow? must you not borrow? must they not borrow?	must I not be borrowing? must you not be borrowing? must he not be borrowing? must we not be borrowing? must you not be borrowing? must they not be borrowing?
Perfect	V-ing perfect
must I not have borrowed? must you not have borrowed? must he not have borrowed? must we not have borrowed? must you not have borrowed? must they not have borrowed?	must I not have been borrowing? must you not have been borrowing? must he not have been borrowing? must we not have been borrowing? must you not have been borrowing? must they not have been borrowing?