I must extinguish you must extinguish she must extinguish we must extinguish you must extinguish they must extinguish
V-ing form
I must be extinguishing you must be extinguishing she must be extinguishing we must be extinguishing you must be extinguishing they must be extinguishing
Perfect
I must have extinguished you must have extinguished she must have extinguished we must have extinguished you must have extinguished they must have extinguished
V-ing perfect
I must have been extinguishing you must have been extinguishing she must have been extinguishing we must have been extinguishing you must have been extinguishing they must have been extinguishing
Negation
Simple form
I mustn't extinguish you mustn't extinguish she mustn't extinguish we mustn't extinguish you mustn't extinguish they mustn't extinguish
V-ing form
I mustn't be extinguishing you mustn't be extinguishing she mustn't be extinguishing we mustn't be extinguishing you mustn't be extinguishing they mustn't be extinguishing
Perfect
I mustn't have extinguished you mustn't have extinguished she mustn't have extinguished we mustn't have extinguished you mustn't have extinguished they mustn't have extinguished
V-ing perfect
I mustn't have been extinguishing you mustn't have been extinguishing she mustn't have been extinguishing we mustn't have been extinguishing you mustn't have been extinguishing they mustn't have been extinguishing
Interrogative form
Simple form
must I extinguish? must you extinguish? must she extinguish? must we extinguish? must you extinguish? must they extinguish?
V-ing form
must I be extinguishing? must you be extinguishing? must she be extinguishing? must we be extinguishing? must you be extinguishing? must they be extinguishing?
Perfect
must I have extinguished? must you have extinguished? must she have extinguished? must we have extinguished? must you have extinguished? must they have extinguished?
V-ing perfect
must I have been extinguishing? must you have been extinguishing? must she have been extinguishing? must we have been extinguishing? must you have been extinguishing? must they have been extinguishing?
Interro-negative form
Simple form
mustn't I extinguish? mustn't you extinguish? mustn't she extinguish? mustn't we extinguish? mustn't you extinguish? mustn't they extinguish?
V-ing form
mustn't I be extinguishing? mustn't you be extinguishing? mustn't she be extinguishing? mustn't we be extinguishing? mustn't you be extinguishing? mustn't they be extinguishing?
Perfect
mustn't I have extinguished? mustn't you have extinguished? mustn't she have extinguished? mustn't we have extinguished? mustn't you have extinguished? mustn't they have extinguished?
V-ing perfect
mustn't I have been extinguishing? mustn't you have been extinguishing? mustn't she have been extinguishing? mustn't we have been extinguishing? mustn't you have been extinguishing? mustn't they have been extinguishing?