should filter
Verbo regular: filter - filtered- filtered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd filter
you'd filter
he'd filter
we'd filter
you'd filter
they'd filter 	I'd be filtering
you'd be filtering
he'd be filtering
we'd be filtering
you'd be filtering
they'd be filtering	I should've filtered
you should've filtered
he should've filtered
we should've filtered
you should've filtered
they should've filtered	I should've been filtering
you should've been filtering
he should've been filtering
we should've been filtering
you should've been filtering
they should've been filtering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't filter
you shouldn't filter
he shouldn't filter
we shouldn't filter
you shouldn't filter
they shouldn't filter 	I shouldn't be filtering
you shouldn't be filtering
he shouldn't be filtering
we shouldn't be filtering
you shouldn't be filtering
they shouldn't be filtering	I shouldn't have filtered
you shouldn't have filtered
he shouldn't have filtered
we shouldn't have filtered
you shouldn't have filtered
they shouldn't have filtered	I shouldn't have been filtering
you shouldn't have been filtering
he shouldn't have been filtering
we shouldn't have been filtering
you shouldn't have been filtering
they shouldn't have been filtering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I filter?
should you filter?
should he filter?
should we filter?
should you filter?
should they filter? 	should I be filtering?
should you be filtering?
should he be filtering?
should we be filtering?
should you be filtering?
should they be filtering? 	should I have filtered?
should you have filtered?
should he have filtered?
should we have filtered?
should you have filtered?
should they have filtered? 	should I have been filtering?
should you have been filtering?
should he have been filtering?
should we have been filtering?
should you have been filtering?
should they have been filtering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I filter?
shouldn't you filter?
shouldn't he filter?
shouldn't we filter?
shouldn't you filter?
shouldn't they filter? 	shouldn't I be filtering?
shouldn't you be filtering?
shouldn't he be filtering?
shouldn't we be filtering?
shouldn't you be filtering?
shouldn't they be filtering? 	shouldn't I have filtered?
shouldn't you have filtered?
shouldn't he have filtered?
shouldn't we have filtered?
shouldn't you have filtered?
shouldn't they have filtered? 	shouldn't I have been filtering?
shouldn't you have been filtering?
shouldn't he have been filtering?
shouldn't we have been filtering?
shouldn't you have been filtering?
shouldn't they have been filtering?