could niggle
Verbo regular: niggle - niggled- niggled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could niggle
you could niggle
he could niggle
we could niggle
you could niggle
they could niggle 	I could be niggling
you could be niggling
he could be niggling
we could be niggling
you could be niggling
they could be niggling	I could have niggled
you could have niggled
he could have niggled
we could have niggled
you could have niggled
they could have niggled	I could have been niggling
you could have been niggling
he could have been niggling
we could have been niggling
you could have been niggling
they could have been niggling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not niggle
you could not niggle
he could not niggle
we could not niggle
you could not niggle
they could not niggle 	I could not be niggling
you could not be niggling
he could not be niggling
we could not be niggling
you could not be niggling
they could not be niggling	I could not have niggled
you could not have niggled
he could not have niggled
we could not have niggled
you could not have niggled
they could not have niggled	I could not have been niggling
you could not have been niggling
he could not have been niggling
we could not have been niggling
you could not have been niggling
they could not have been niggling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I niggle?
could you niggle?
could he niggle?
could we niggle?
could you niggle?
could they niggle? 	could I be niggling?
could you be niggling?
could he be niggling?
could we be niggling?
could you be niggling?
could they be niggling? 	could I have niggled?
could you have niggled?
could he have niggled?
could we have niggled?
could you have niggled?
could they have niggled? 	could I have been niggling?
could you have been niggling?
could he have been niggling?
could we have been niggling?
could you have been niggling?
could they have been niggling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not niggle?
could you not niggle?
could he not niggle?
could we not niggle?
could you not niggle?
could they not niggle? 	could I not be niggling?
could you not be niggling?
could he not be niggling?
could we not be niggling?
could you not be niggling?
could they not be niggling? 	could I not have niggled?
could you not have niggled?
could he not have niggled?
could we not have niggled?
could you not have niggled?
could they not have niggled? 	could I not have been niggling?
could you not have been niggling?
could he not have been niggling?
could we not have been niggling?
could you not have been niggling?
could they not have been niggling?