must expire
Verbo regular: expire - expired- expired

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must expire
you must expire
he must expire
we must expire
you must expire
they must expire 	I must be expiring
you must be expiring
he must be expiring
we must be expiring
you must be expiring
they must be expiring	I must have expired
you must have expired
he must have expired
we must have expired
you must have expired
they must have expired	I must have been expiring
you must have been expiring
he must have been expiring
we must have been expiring
you must have been expiring
they must have been expiring	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not expire
you must not expire
he must not expire
we must not expire
you must not expire
they must not expire 	I must not be expiring
you must not be expiring
he must not be expiring
we must not be expiring
you must not be expiring
they must not be expiring	I must not have expired
you must not have expired
he must not have expired
we must not have expired
you must not have expired
they must not have expired	I must not have been expiring
you must not have been expiring
he must not have been expiring
we must not have been expiring
you must not have been expiring
they must not have been expiring	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I expire?
must you expire?
must he expire?
must we expire?
must you expire?
must they expire? 	must I be expiring?
must you be expiring?
must he be expiring?
must we be expiring?
must you be expiring?
must they be expiring? 	must I have expired?
must you have expired?
must he have expired?
must we have expired?
must you have expired?
must they have expired? 	must I have been expiring?
must you have been expiring?
must he have been expiring?
must we have been expiring?
must you have been expiring?
must they have been expiring? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not expire?
must you not expire?
must he not expire?
must we not expire?
must you not expire?
must they not expire? 	must I not be expiring?
must you not be expiring?
must he not be expiring?
must we not be expiring?
must you not be expiring?
must they not be expiring? 	must I not have expired?
must you not have expired?
must he not have expired?
must we not have expired?
must you not have expired?
must they not have expired? 	must I not have been expiring?
must you not have been expiring?
must he not have been expiring?
must we not have been expiring?
must you not have been expiring?
must they not have been expiring?