could countersink
Verbo irregular: countersink - countersank- countersunk

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con 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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not countersink
you could not countersink
she 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
she 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
she 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
she could not have been countersinking
we could not have been countersinking
you could not have been countersinking
they could not have been countersinking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con 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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not countersink?
could you not countersink?
could she 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 she 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 she 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 she not have been countersinking?
could we not have been countersinking?
could you not have been countersinking?
could they not have been countersinking?