should backfill
Verbo regular: backfill - backfilled- backfilled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd backfill
you'd backfill
she'd backfill
we'd backfill
you'd backfill
they'd backfill 	I'd be backfilling
you'd be backfilling
she'd be backfilling
we'd be backfilling
you'd be backfilling
they'd be backfilling	I should've backfilled
you should've backfilled
she should've backfilled
we should've backfilled
you should've backfilled
they should've backfilled	I should've been backfilling
you should've been backfilling
she should've been backfilling
we should've been backfilling
you should've been backfilling
they should've been backfilling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't backfill
you shouldn't backfill
she shouldn't backfill
we shouldn't backfill
you shouldn't backfill
they shouldn't backfill 	I shouldn't be backfilling
you shouldn't be backfilling
she shouldn't be backfilling
we shouldn't be backfilling
you shouldn't be backfilling
they shouldn't be backfilling	I shouldn't have backfilled
you shouldn't have backfilled
she shouldn't have backfilled
we shouldn't have backfilled
you shouldn't have backfilled
they shouldn't have backfilled	I shouldn't have been backfilling
you shouldn't have been backfilling
she shouldn't have been backfilling
we shouldn't have been backfilling
you shouldn't have been backfilling
they shouldn't have been backfilling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I backfill?
should you backfill?
should she backfill?
should we backfill?
should you backfill?
should they backfill? 	should I be backfilling?
should you be backfilling?
should she be backfilling?
should we be backfilling?
should you be backfilling?
should they be backfilling? 	should I have backfilled?
should you have backfilled?
should she have backfilled?
should we have backfilled?
should you have backfilled?
should they have backfilled? 	should I have been backfilling?
should you have been backfilling?
should she have been backfilling?
should we have been backfilling?
should you have been backfilling?
should they have been backfilling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I backfill?
shouldn't you backfill?
shouldn't she backfill?
shouldn't we backfill?
shouldn't you backfill?
shouldn't they backfill? 	shouldn't I be backfilling?
shouldn't you be backfilling?
shouldn't she be backfilling?
shouldn't we be backfilling?
shouldn't you be backfilling?
shouldn't they be backfilling? 	shouldn't I have backfilled?
shouldn't you have backfilled?
shouldn't she have backfilled?
shouldn't we have backfilled?
shouldn't you have backfilled?
shouldn't they have backfilled? 	shouldn't I have been backfilling?
shouldn't you have been backfilling?
shouldn't she have been backfilling?
shouldn't we have been backfilling?
shouldn't you have been backfilling?
shouldn't they have been backfilling?