could tone
Verbo regular: tone - toned- toned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could tone
you could tone
he could tone
we could tone
you could tone
they could tone 	I could be toning
you could be toning
he could be toning
we could be toning
you could be toning
they could be toning	I could have toned
you could have toned
he could have toned
we could have toned
you could have toned
they could have toned	I could have been toning
you could have been toning
he could have been toning
we could have been toning
you could have been toning
they could have been toning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not tone
you could not tone
he could not tone
we could not tone
you could not tone
they could not tone 	I could not be toning
you could not be toning
he could not be toning
we could not be toning
you could not be toning
they could not be toning	I could not have toned
you could not have toned
he could not have toned
we could not have toned
you could not have toned
they could not have toned	I could not have been toning
you could not have been toning
he could not have been toning
we could not have been toning
you could not have been toning
they could not have been toning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I tone?
could you tone?
could he tone?
could we tone?
could you tone?
could they tone? 	could I be toning?
could you be toning?
could he be toning?
could we be toning?
could you be toning?
could they be toning? 	could I have toned?
could you have toned?
could he have toned?
could we have toned?
could you have toned?
could they have toned? 	could I have been toning?
could you have been toning?
could he have been toning?
could we have been toning?
could you have been toning?
could they have been toning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not tone?
could you not tone?
could he not tone?
could we not tone?
could you not tone?
could they not tone? 	could I not be toning?
could you not be toning?
could he not be toning?
could we not be toning?
could you not be toning?
could they not be toning? 	could I not have toned?
could you not have toned?
could he not have toned?
could we not have toned?
could you not have toned?
could they not have toned? 	could I not have been toning?
could you not have been toning?
could he not have been toning?
could we not have been toning?
could you not have been toning?
could they not have been toning?