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
she could countersink
we could countersink
you could countersink
they could countersink 	I could be countersinking
you could be countersinking
she could be countersinking
we could be countersinking
you could be countersinking
they could be countersinking	I could have countersunk
you could have countersunk
she 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
she 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 couldn't countersink
you couldn't countersink
she couldn't countersink
we couldn't countersink
you couldn't countersink
they couldn't countersink 	I couldn't be countersinking
you couldn't be countersinking
she couldn't be countersinking
we couldn't be countersinking
you couldn't be countersinking
they couldn't be countersinking	I couldn't have countersunk
you couldn't have countersunk
she couldn't have countersunk
we couldn't have countersunk
you couldn't have countersunk
they couldn't have countersunk	I couldn't have been countersinking
you couldn't have been countersinking
she couldn't have been countersinking
we couldn't have been countersinking
you couldn't have been countersinking
they couldn't have been countersinking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I countersink?
could you countersink?
could she countersink?
could we countersink?
could you countersink?
could they countersink? 	could I be countersinking?
could you be countersinking?
could she be countersinking?
could we be countersinking?
could you be countersinking?
could they be countersinking? 	could I have countersunk?
could you have countersunk?
could she 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 she 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 	
couldn't I countersink?
couldn't you countersink?
couldn't she countersink?
couldn't we countersink?
couldn't you countersink?
couldn't they countersink? 	couldn't I be countersinking?
couldn't you be countersinking?
couldn't she be countersinking?
couldn't we be countersinking?
couldn't you be countersinking?
couldn't they be countersinking? 	couldn't I have countersunk?
couldn't you have countersunk?
couldn't she have countersunk?
couldn't we have countersunk?
couldn't you have countersunk?
couldn't they have countersunk? 	couldn't I have been countersinking?
couldn't you have been countersinking?
couldn't she have been countersinking?
couldn't we have been countersinking?
couldn't you have been countersinking?
couldn't they have been countersinking?