must refilter
Verbo regular: refilter - refiltered- refiltered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must refilter
you must refilter
he must refilter
we must refilter
you must refilter
they must refilter 	I must be refiltering
you must be refiltering
he must be refiltering
we must be refiltering
you must be refiltering
they must be refiltering	I must have refiltered
you must have refiltered
he must have refiltered
we must have refiltered
you must have refiltered
they must have refiltered	I must have been refiltering
you must have been refiltering
he must have been refiltering
we must have been refiltering
you must have been refiltering
they must have been refiltering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not refilter
you must not refilter
he must not refilter
we must not refilter
you must not refilter
they must not refilter 	I must not be refiltering
you must not be refiltering
he must not be refiltering
we must not be refiltering
you must not be refiltering
they must not be refiltering	I must not have refiltered
you must not have refiltered
he must not have refiltered
we must not have refiltered
you must not have refiltered
they must not have refiltered	I must not have been refiltering
you must not have been refiltering
he must not have been refiltering
we must not have been refiltering
you must not have been refiltering
they must not have been refiltering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I refilter?
must you refilter?
must he refilter?
must we refilter?
must you refilter?
must they refilter? 	must I be refiltering?
must you be refiltering?
must he be refiltering?
must we be refiltering?
must you be refiltering?
must they be refiltering? 	must I have refiltered?
must you have refiltered?
must he have refiltered?
must we have refiltered?
must you have refiltered?
must they have refiltered? 	must I have been refiltering?
must you have been refiltering?
must he have been refiltering?
must we have been refiltering?
must you have been refiltering?
must they have been refiltering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not refilter?
must you not refilter?
must he not refilter?
must we not refilter?
must you not refilter?
must they not refilter? 	must I not be refiltering?
must you not be refiltering?
must he not be refiltering?
must we not be refiltering?
must you not be refiltering?
must they not be refiltering? 	must I not have refiltered?
must you not have refiltered?
must he not have refiltered?
must we not have refiltered?
must you not have refiltered?
must they not have refiltered? 	must I not have been refiltering?
must you not have been refiltering?
must he not have been refiltering?
must we not have been refiltering?
must you not have been refiltering?
must they not have been refiltering?