must cluster
Verbo regolare: cluster - clustered- clustered

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must cluster
you must cluster
he must cluster
we must cluster
you must cluster
they must cluster 	I must be clustering
you must be clustering
he must be clustering
we must be clustering
you must be clustering
they must be clustering	I must have clustered
you must have clustered
he must have clustered
we must have clustered
you must have clustered
they must have clustered	I must have been clustering
you must have been clustering
he must have been clustering
we must have been clustering
you must have been clustering
they must have been clustering	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not cluster
you must not cluster
he must not cluster
we must not cluster
you must not cluster
they must not cluster 	I must not be clustering
you must not be clustering
he must not be clustering
we must not be clustering
you must not be clustering
they must not be clustering	I must not have clustered
you must not have clustered
he must not have clustered
we must not have clustered
you must not have clustered
they must not have clustered	I must not have been clustering
you must not have been clustering
he must not have been clustering
we must not have been clustering
you must not have been clustering
they must not have been clustering	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I cluster?
must you cluster?
must he cluster?
must we cluster?
must you cluster?
must they cluster? 	must I be clustering?
must you be clustering?
must he be clustering?
must we be clustering?
must you be clustering?
must they be clustering? 	must I have clustered?
must you have clustered?
must he have clustered?
must we have clustered?
must you have clustered?
must they have clustered? 	must I have been clustering?
must you have been clustering?
must he have been clustering?
must we have been clustering?
must you have been clustering?
must they have been clustering? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not cluster?
must you not cluster?
must he not cluster?
must we not cluster?
must you not cluster?
must they not cluster? 	must I not be clustering?
must you not be clustering?
must he not be clustering?
must we not be clustering?
must you not be clustering?
must they not be clustering? 	must I not have clustered?
must you not have clustered?
must he not have clustered?
must we not have clustered?
must you not have clustered?
must they not have clustered? 	must I not have been clustering?
must you not have been clustering?
must he not have been clustering?
must we not have been clustering?
must you not have been clustering?
must they not have been clustering?