English verb conjugation
MUST EXTINGUISH

Regular verb: extinguish - extinguished - extinguished

Affirmation

Simple form	V-ing form
I must extinguish you must extinguish he must extinguish we must extinguish you must extinguish they must extinguish	I must be extinguishing you must be extinguishing he must be extinguishing we must be extinguishing you must be extinguishing they must be extinguishing
Perfect	V-ing perfect
I must have extinguished you must have extinguished he must have extinguished we must have extinguished you must have extinguished they must have extinguished	I must have been extinguishing you must have been extinguishing he must have been extinguishing we must have been extinguishing you must have been extinguishing they must have been extinguishing

Negation

Simple form	V-ing form
I must not extinguish you must not extinguish he must not extinguish we must not extinguish you must not extinguish they must not extinguish	I must not be extinguishing you must not be extinguishing he must not be extinguishing we must not be extinguishing you must not be extinguishing they must not be extinguishing
Perfect	V-ing perfect
I must not have extinguished you must not have extinguished he must not have extinguished we must not have extinguished you must not have extinguished they must not have extinguished	I must not have been extinguishing you must not have been extinguishing he must not have been extinguishing we must not have been extinguishing you must not have been extinguishing they must not have been extinguishing

Interrogative form

Simple form	V-ing form
must I extinguish? must you extinguish? must he extinguish? must we extinguish? must you extinguish? must they extinguish?	must I be extinguishing? must you be extinguishing? must he be extinguishing? must we be extinguishing? must you be extinguishing? must they be extinguishing?
Perfect	V-ing perfect
must I have extinguished? must you have extinguished? must he have extinguished? must we have extinguished? must you have extinguished? must they have extinguished?	must I have been extinguishing? must you have been extinguishing? must he have been extinguishing? must we have been extinguishing? must you have been extinguishing? must they have been extinguishing?

Interro-negative form

Simple form	V-ing form
must I not extinguish? must you not extinguish? must he not extinguish? must we not extinguish? must you not extinguish? must they not extinguish?	must I not be extinguishing? must you not be extinguishing? must he not be extinguishing? must we not be extinguishing? must you not be extinguishing? must they not be extinguishing?
Perfect	V-ing perfect
must I not have extinguished? must you not have extinguished? must he not have extinguished? must we not have extinguished? must you not have extinguished? must they not have extinguished?	must I not have been extinguishing? must you not have been extinguishing? must he not have been extinguishing? must we not have been extinguishing? must you not have been extinguishing? must they not have been extinguishing?