could nag
Verbo regular: nag - nagged- nagged

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could nag
you could nag
he could nag
we could nag
you could nag
they could nag 	I could be nagging
you could be nagging
he could be nagging
we could be nagging
you could be nagging
they could be nagging	I could have nagged
you could have nagged
he could have nagged
we could have nagged
you could have nagged
they could have nagged	I could have been nagging
you could have been nagging
he could have been nagging
we could have been nagging
you could have been nagging
they could have been nagging	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not nag
you could not nag
he could not nag
we could not nag
you could not nag
they could not nag 	I could not be nagging
you could not be nagging
he could not be nagging
we could not be nagging
you could not be nagging
they could not be nagging	I could not have nagged
you could not have nagged
he could not have nagged
we could not have nagged
you could not have nagged
they could not have nagged	I could not have been nagging
you could not have been nagging
he could not have been nagging
we could not have been nagging
you could not have been nagging
they could not have been nagging	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I nag?
could you nag?
could he nag?
could we nag?
could you nag?
could they nag? 	could I be nagging?
could you be nagging?
could he be nagging?
could we be nagging?
could you be nagging?
could they be nagging? 	could I have nagged?
could you have nagged?
could he have nagged?
could we have nagged?
could you have nagged?
could they have nagged? 	could I have been nagging?
could you have been nagging?
could he have been nagging?
could we have been nagging?
could you have been nagging?
could they have been nagging? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not nag?
could you not nag?
could he not nag?
could we not nag?
could you not nag?
could they not nag? 	could I not be nagging?
could you not be nagging?
could he not be nagging?
could we not be nagging?
could you not be nagging?
could they not be nagging? 	could I not have nagged?
could you not have nagged?
could he not have nagged?
could we not have nagged?
could you not have nagged?
could they not have nagged? 	could I not have been nagging?
could you not have been nagging?
could he not have been nagging?
could we not have been nagging?
could you not have been nagging?
could they not have been nagging?