English verb conjugation
MUST PERISH

Regular verb: perish - perished - perished

Affirmation

Simple form	V-ing form
I must perish you must perish he must perish we must perish you must perish they must perish	I must be perishing you must be perishing he must be perishing we must be perishing you must be perishing they must be perishing
Perfect	V-ing perfect
I must have perished you must have perished he must have perished we must have perished you must have perished they must have perished	I must have been perishing you must have been perishing he must have been perishing we must have been perishing you must have been perishing they must have been perishing

Negation

Simple form	V-ing form
I mustn't perish you mustn't perish he mustn't perish we mustn't perish you mustn't perish they mustn't perish	I mustn't be perishing you mustn't be perishing he mustn't be perishing we mustn't be perishing you mustn't be perishing they mustn't be perishing
Perfect	V-ing perfect
I mustn't have perished you mustn't have perished he mustn't have perished we mustn't have perished you mustn't have perished they mustn't have perished	I mustn't have been perishing you mustn't have been perishing he mustn't have been perishing we mustn't have been perishing you mustn't have been perishing they mustn't have been perishing

Interrogative form

Simple form	V-ing form
must I perish? must you perish? must he perish? must we perish? must you perish? must they perish?	must I be perishing? must you be perishing? must he be perishing? must we be perishing? must you be perishing? must they be perishing?
Perfect	V-ing perfect
must I have perished? must you have perished? must he have perished? must we have perished? must you have perished? must they have perished?	must I have been perishing? must you have been perishing? must he have been perishing? must we have been perishing? must you have been perishing? must they have been perishing?

Interro-negative form

Simple form	V-ing form
mustn't I perish? mustn't you perish? mustn't he perish? mustn't we perish? mustn't you perish? mustn't they perish?	mustn't I be perishing? mustn't you be perishing? mustn't he be perishing? mustn't we be perishing? mustn't you be perishing? mustn't they be perishing?
Perfect	V-ing perfect
mustn't I have perished? mustn't you have perished? mustn't he have perished? mustn't we have perished? mustn't you have perished? mustn't they have perished?	mustn't I have been perishing? mustn't you have been perishing? mustn't he have been perishing? mustn't we have been perishing? mustn't you have been perishing? mustn't they have been perishing?