could clack
Verbe régulier : clack - clacked- clacked

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could clack
you could clack
he could clack
we could clack
you could clack
they could clack 	I could be clacking
you could be clacking
he could be clacking
we could be clacking
you could be clacking
they could be clacking	I could have clacked
you could have clacked
he could have clacked
we could have clacked
you could have clacked
they could have clacked	I could have been clacking
you could have been clacking
he could have been clacking
we could have been clacking
you could have been clacking
they could have been clacking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not clack
you could not clack
he could not clack
we could not clack
you could not clack
they could not clack 	I could not be clacking
you could not be clacking
he could not be clacking
we could not be clacking
you could not be clacking
they could not be clacking	I could not have clacked
you could not have clacked
he could not have clacked
we could not have clacked
you could not have clacked
they could not have clacked	I could not have been clacking
you could not have been clacking
he could not have been clacking
we could not have been clacking
you could not have been clacking
they could not have been clacking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I clack?
could you clack?
could he clack?
could we clack?
could you clack?
could they clack? 	could I be clacking?
could you be clacking?
could he be clacking?
could we be clacking?
could you be clacking?
could they be clacking? 	could I have clacked?
could you have clacked?
could he have clacked?
could we have clacked?
could you have clacked?
could they have clacked? 	could I have been clacking?
could you have been clacking?
could he have been clacking?
could we have been clacking?
could you have been clacking?
could they have been clacking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not clack?
could you not clack?
could he not clack?
could we not clack?
could you not clack?
could they not clack? 	could I not be clacking?
could you not be clacking?
could he not be clacking?
could we not be clacking?
could you not be clacking?
could they not be clacking? 	could I not have clacked?
could you not have clacked?
could he not have clacked?
could we not have clacked?
could you not have clacked?
could they not have clacked? 	could I not have been clacking?
could you not have been clacking?
could he not have been clacking?
could we not have been clacking?
could you not have been clacking?
could they not have been clacking?