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