must cluster
Verbe régulier : cluster - clustered- clustered
Traduction française : se grouper - former un groupe 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must cluster
you must cluster
she must cluster
we must cluster
you must cluster
they must cluster 	I must be clustering
you must be clustering
she must be clustering
we must be clustering
you must be clustering
they must be clustering	I must have clustered
you must have clustered
she 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
she must have been clustering
we must have been clustering
you must have been clustering
they must have been clustering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't cluster
you mustn't cluster
she mustn't cluster
we mustn't cluster
you mustn't cluster
they mustn't cluster 	I mustn't be clustering
you mustn't be clustering
she mustn't be clustering
we mustn't be clustering
you mustn't be clustering
they mustn't be clustering	I mustn't have clustered
you mustn't have clustered
she mustn't have clustered
we mustn't have clustered
you mustn't have clustered
they mustn't have clustered	I mustn't have been clustering
you mustn't have been clustering
she mustn't have been clustering
we mustn't have been clustering
you mustn't have been clustering
they mustn't have been clustering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I cluster?
must you cluster?
must she cluster?
must we cluster?
must you cluster?
must they cluster? 	must I be clustering?
must you be clustering?
must she be clustering?
must we be clustering?
must you be clustering?
must they be clustering? 	must I have clustered?
must you have clustered?
must she 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 she have been clustering?
must we have been clustering?
must you have been clustering?
must they have been clustering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I cluster?
mustn't you cluster?
mustn't she cluster?
mustn't we cluster?
mustn't you cluster?
mustn't they cluster? 	mustn't I be clustering?
mustn't you be clustering?
mustn't she be clustering?
mustn't we be clustering?
mustn't you be clustering?
mustn't they be clustering? 	mustn't I have clustered?
mustn't you have clustered?
mustn't she have clustered?
mustn't we have clustered?
mustn't you have clustered?
mustn't they have clustered? 	mustn't I have been clustering?
mustn't you have been clustering?
mustn't she have been clustering?
mustn't we have been clustering?
mustn't you have been clustering?
mustn't they have been clustering?