English verb conjugation
MUST PERTAIN

Regular verb: pertain - pertained - pertained

Affirmation

Simple form	V-ing form
I must pertain you must pertain he must pertain we must pertain you must pertain they must pertain	I must be pertaining you must be pertaining he must be pertaining we must be pertaining you must be pertaining they must be pertaining
Perfect	V-ing perfect
I must have pertained you must have pertained he must have pertained we must have pertained you must have pertained they must have pertained	I must have been pertaining you must have been pertaining he must have been pertaining we must have been pertaining you must have been pertaining they must have been pertaining

Negation

Simple form	V-ing form
I must not pertain you must not pertain he must not pertain we must not pertain you must not pertain they must not pertain	I must not be pertaining you must not be pertaining he must not be pertaining we must not be pertaining you must not be pertaining they must not be pertaining
Perfect	V-ing perfect
I must not have pertained you must not have pertained he must not have pertained we must not have pertained you must not have pertained they must not have pertained	I must not have been pertaining you must not have been pertaining he must not have been pertaining we must not have been pertaining you must not have been pertaining they must not have been pertaining

Interrogative form

Simple form	V-ing form
must I pertain? must you pertain? must he pertain? must we pertain? must you pertain? must they pertain?	must I be pertaining? must you be pertaining? must he be pertaining? must we be pertaining? must you be pertaining? must they be pertaining?
Perfect	V-ing perfect
must I have pertained? must you have pertained? must he have pertained? must we have pertained? must you have pertained? must they have pertained?	must I have been pertaining? must you have been pertaining? must he have been pertaining? must we have been pertaining? must you have been pertaining? must they have been pertaining?

Interro-negative form

Simple form	V-ing form
must I not pertain? must you not pertain? must he not pertain? must we not pertain? must you not pertain? must they not pertain?	must I not be pertaining? must you not be pertaining? must he not be pertaining? must we not be pertaining? must you not be pertaining? must they not be pertaining?
Perfect	V-ing perfect
must I not have pertained? must you not have pertained? must he not have pertained? must we not have pertained? must you not have pertained? must they not have pertained?	must I not have been pertaining? must you not have been pertaining? must he not have been pertaining? must we not have been pertaining? must you not have been pertaining? must they not have been pertaining?