English verb conjugation
MUST SORROW

Regular verb: sorrow - sorrowed - sorrowed

Affirmation

Simple form	V-ing form
I must sorrow you must sorrow he must sorrow we must sorrow you must sorrow they must sorrow	I must be sorrowing you must be sorrowing he must be sorrowing we must be sorrowing you must be sorrowing they must be sorrowing
Perfect	V-ing perfect
I must have sorrowed you must have sorrowed he must have sorrowed we must have sorrowed you must have sorrowed they must have sorrowed	I must have been sorrowing you must have been sorrowing he must have been sorrowing we must have been sorrowing you must have been sorrowing they must have been sorrowing

Negation

Simple form	V-ing form
I must not sorrow you must not sorrow he must not sorrow we must not sorrow you must not sorrow they must not sorrow	I must not be sorrowing you must not be sorrowing he must not be sorrowing we must not be sorrowing you must not be sorrowing they must not be sorrowing
Perfect	V-ing perfect
I must not have sorrowed you must not have sorrowed he must not have sorrowed we must not have sorrowed you must not have sorrowed they must not have sorrowed	I must not have been sorrowing you must not have been sorrowing he must not have been sorrowing we must not have been sorrowing you must not have been sorrowing they must not have been sorrowing

Interrogative form

Simple form	V-ing form
must I sorrow? must you sorrow? must he sorrow? must we sorrow? must you sorrow? must they sorrow?	must I be sorrowing? must you be sorrowing? must he be sorrowing? must we be sorrowing? must you be sorrowing? must they be sorrowing?
Perfect	V-ing perfect
must I have sorrowed? must you have sorrowed? must he have sorrowed? must we have sorrowed? must you have sorrowed? must they have sorrowed?	must I have been sorrowing? must you have been sorrowing? must he have been sorrowing? must we have been sorrowing? must you have been sorrowing? must they have been sorrowing?

Interro-negative form

Simple form	V-ing form
must I not sorrow? must you not sorrow? must he not sorrow? must we not sorrow? must you not sorrow? must they not sorrow?	must I not be sorrowing? must you not be sorrowing? must he not be sorrowing? must we not be sorrowing? must you not be sorrowing? must they not be sorrowing?
Perfect	V-ing perfect
must I not have sorrowed? must you not have sorrowed? must he not have sorrowed? must we not have sorrowed? must you not have sorrowed? must they not have sorrowed?	must I not have been sorrowing? must you not have been sorrowing? must he not have been sorrowing? must we not have been sorrowing? must you not have been sorrowing? must they not have been sorrowing?