could sieve
Verbo regolare: sieve - sieved- sieved

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could sieve
you could sieve
he could sieve
we could sieve
you could sieve
they could sieve 	I could be sieving
you could be sieving
he could be sieving
we could be sieving
you could be sieving
they could be sieving	I could have sieved
you could have sieved
he could have sieved
we could have sieved
you could have sieved
they could have sieved	I could have been sieving
you could have been sieving
he could have been sieving
we could have been sieving
you could have been sieving
they could have been sieving	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I couldn't sieve
you couldn't sieve
he couldn't sieve
we couldn't sieve
you couldn't sieve
they couldn't sieve 	I couldn't be sieving
you couldn't be sieving
he couldn't be sieving
we couldn't be sieving
you couldn't be sieving
they couldn't be sieving	I couldn't have sieved
you couldn't have sieved
he couldn't have sieved
we couldn't have sieved
you couldn't have sieved
they couldn't have sieved	I couldn't have been sieving
you couldn't have been sieving
he couldn't have been sieving
we couldn't have been sieving
you couldn't have been sieving
they couldn't have been sieving	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I sieve?
could you sieve?
could he sieve?
could we sieve?
could you sieve?
could they sieve? 	could I be sieving?
could you be sieving?
could he be sieving?
could we be sieving?
could you be sieving?
could they be sieving? 	could I have sieved?
could you have sieved?
could he have sieved?
could we have sieved?
could you have sieved?
could they have sieved? 	could I have been sieving?
could you have been sieving?
could he have been sieving?
could we have been sieving?
could you have been sieving?
could they have been sieving? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
couldn't I sieve?
couldn't you sieve?
couldn't he sieve?
couldn't we sieve?
couldn't you sieve?
couldn't they sieve? 	couldn't I be sieving?
couldn't you be sieving?
couldn't he be sieving?
couldn't we be sieving?
couldn't you be sieving?
couldn't they be sieving? 	couldn't I have sieved?
couldn't you have sieved?
couldn't he have sieved?
couldn't we have sieved?
couldn't you have sieved?
couldn't they have sieved? 	couldn't I have been sieving?
couldn't you have been sieving?
couldn't he have been sieving?
couldn't we have been sieving?
couldn't you have been sieving?
couldn't they have been sieving?