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 mustn't pertain you mustn't pertain he mustn't pertain we mustn't pertain you mustn't pertain they mustn't pertain	I mustn't be pertaining you mustn't be pertaining he mustn't be pertaining we mustn't be pertaining you mustn't be pertaining they mustn't be pertaining
Perfect	V-ing perfect
I mustn't have pertained you mustn't have pertained he mustn't have pertained we mustn't have pertained you mustn't have pertained they mustn't have pertained	I mustn't have been pertaining you mustn't have been pertaining he mustn't have been pertaining we mustn't have been pertaining you mustn't have been pertaining they mustn't 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
mustn't I pertain? mustn't you pertain? mustn't he pertain? mustn't we pertain? mustn't you pertain? mustn't they pertain?	mustn't I be pertaining? mustn't you be pertaining? mustn't he be pertaining? mustn't we be pertaining? mustn't you be pertaining? mustn't they be pertaining?
Perfect	V-ing perfect
mustn't I have pertained? mustn't you have pertained? mustn't he have pertained? mustn't we have pertained? mustn't you have pertained? mustn't they have pertained?	mustn't I have been pertaining? mustn't you have been pertaining? mustn't he have been pertaining? mustn't we have been pertaining? mustn't you have been pertaining? mustn't they have been pertaining?