could spiral
Verbo regular: spiral - spiralled- spiralled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could spiral
you could spiral
he could spiral
we could spiral
you could spiral
they could spiral 	I could be spiralling
you could be spiralling
he could be spiralling
we could be spiralling
you could be spiralling
they could be spiralling	I could have spiralled
you could have spiralled
he could have spiralled
we could have spiralled
you could have spiralled
they could have spiralled	I could have been spiralling
you could have been spiralling
he could have been spiralling
we could have been spiralling
you could have been spiralling
they could have been spiralling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not spiral
you could not spiral
he could not spiral
we could not spiral
you could not spiral
they could not spiral 	I could not be spiralling
you could not be spiralling
he could not be spiralling
we could not be spiralling
you could not be spiralling
they could not be spiralling	I could not have spiralled
you could not have spiralled
he could not have spiralled
we could not have spiralled
you could not have spiralled
they could not have spiralled	I could not have been spiralling
you could not have been spiralling
he could not have been spiralling
we could not have been spiralling
you could not have been spiralling
they could not have been spiralling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I spiral?
could you spiral?
could he spiral?
could we spiral?
could you spiral?
could they spiral? 	could I be spiralling?
could you be spiralling?
could he be spiralling?
could we be spiralling?
could you be spiralling?
could they be spiralling? 	could I have spiralled?
could you have spiralled?
could he have spiralled?
could we have spiralled?
could you have spiralled?
could they have spiralled? 	could I have been spiralling?
could you have been spiralling?
could he have been spiralling?
could we have been spiralling?
could you have been spiralling?
could they have been spiralling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not spiral?
could you not spiral?
could he not spiral?
could we not spiral?
could you not spiral?
could they not spiral? 	could I not be spiralling?
could you not be spiralling?
could he not be spiralling?
could we not be spiralling?
could you not be spiralling?
could they not be spiralling? 	could I not have spiralled?
could you not have spiralled?
could he not have spiralled?
could we not have spiralled?
could you not have spiralled?
could they not have spiralled? 	could I not have been spiralling?
could you not have been spiralling?
could he not have been spiralling?
could we not have been spiralling?
could you not have been spiralling?
could they not have been spiralling?