should sieve
Verbo regular: sieve - sieved- sieved

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd sieve
you'd sieve
he'd sieve
we'd sieve
you'd sieve
they'd sieve 	I'd be sieving
you'd be sieving
he'd be sieving
we'd be sieving
you'd be sieving
they'd be sieving	I should've sieved
you should've sieved
he should've sieved
we should've sieved
you should've sieved
they should've sieved	I should've been sieving
you should've been sieving
he should've been sieving
we should've been sieving
you should've been sieving
they should've been sieving	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't sieve
you shouldn't sieve
he shouldn't sieve
we shouldn't sieve
you shouldn't sieve
they shouldn't sieve 	I shouldn't be sieving
you shouldn't be sieving
he shouldn't be sieving
we shouldn't be sieving
you shouldn't be sieving
they shouldn't be sieving	I shouldn't have sieved
you shouldn't have sieved
he shouldn't have sieved
we shouldn't have sieved
you shouldn't have sieved
they shouldn't have sieved	I shouldn't have been sieving
you shouldn't have been sieving
he shouldn't have been sieving
we shouldn't have been sieving
you shouldn't have been sieving
they shouldn't have been sieving	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I sieve?
should you sieve?
should he sieve?
should we sieve?
should you sieve?
should they sieve? 	should I be sieving?
should you be sieving?
should he be sieving?
should we be sieving?
should you be sieving?
should they be sieving? 	should I have sieved?
should you have sieved?
should he have sieved?
should we have sieved?
should you have sieved?
should they have sieved? 	should I have been sieving?
should you have been sieving?
should he have been sieving?
should we have been sieving?
should you have been sieving?
should they have been sieving? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I sieve?
shouldn't you sieve?
shouldn't he sieve?
shouldn't we sieve?
shouldn't you sieve?
shouldn't they sieve? 	shouldn't I be sieving?
shouldn't you be sieving?
shouldn't he be sieving?
shouldn't we be sieving?
shouldn't you be sieving?
shouldn't they be sieving? 	shouldn't I have sieved?
shouldn't you have sieved?
shouldn't he have sieved?
shouldn't we have sieved?
shouldn't you have sieved?
shouldn't they have sieved? 	shouldn't I have been sieving?
shouldn't you have been sieving?
shouldn't he have been sieving?
shouldn't we have been sieving?
shouldn't you have been sieving?
shouldn't they have been sieving?