could countersink
Verbe irrégulier : countersink - countersank- countersunk

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could countersink
you could countersink
he could countersink
we could countersink
you could countersink
they could countersink 	I could be countersinking
you could be countersinking
he could be countersinking
we could be countersinking
you could be countersinking
they could be countersinking	I could have countersunk
you could have countersunk
he could have countersunk
we could have countersunk
you could have countersunk
they could have countersunk	I could have been countersinking
you could have been countersinking
he could have been countersinking
we could have been countersinking
you could have been countersinking
they could have been countersinking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not countersink
you could not countersink
he could not countersink
we could not countersink
you could not countersink
they could not countersink 	I could not be countersinking
you could not be countersinking
he could not be countersinking
we could not be countersinking
you could not be countersinking
they could not be countersinking	I could not have countersunk
you could not have countersunk
he could not have countersunk
we could not have countersunk
you could not have countersunk
they could not have countersunk	I could not have been countersinking
you could not have been countersinking
he could not have been countersinking
we could not have been countersinking
you could not have been countersinking
they could not have been countersinking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I countersink?
could you countersink?
could he countersink?
could we countersink?
could you countersink?
could they countersink? 	could I be countersinking?
could you be countersinking?
could he be countersinking?
could we be countersinking?
could you be countersinking?
could they be countersinking? 	could I have countersunk?
could you have countersunk?
could he have countersunk?
could we have countersunk?
could you have countersunk?
could they have countersunk? 	could I have been countersinking?
could you have been countersinking?
could he have been countersinking?
could we have been countersinking?
could you have been countersinking?
could they have been countersinking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not countersink?
could you not countersink?
could he not countersink?
could we not countersink?
could you not countersink?
could they not countersink? 	could I not be countersinking?
could you not be countersinking?
could he not be countersinking?
could we not be countersinking?
could you not be countersinking?
could they not be countersinking? 	could I not have countersunk?
could you not have countersunk?
could he not have countersunk?
could we not have countersunk?
could you not have countersunk?
could they not have countersunk? 	could I not have been countersinking?
could you not have been countersinking?
could he not have been countersinking?
could we not have been countersinking?
could you not have been countersinking?
could they not have been countersinking?