must extinguish
Verbo regular: extinguish - extinguished- extinguished

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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?