could 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 could cluster
you could cluster
she could cluster
we could cluster
you could cluster
they could cluster 	I could be clustering
you could be clustering
she could be clustering
we could be clustering
you could be clustering
they could be clustering	I could have clustered
you could have clustered
she could have clustered
we could have clustered
you could have clustered
they could have clustered	I could have been clustering
you could have been clustering
she could have been clustering
we could have been clustering
you could have been clustering
they could have been clustering	

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

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

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