must sieve
Verbo regolare: sieve - sieved- sieved

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

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

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

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