could tong
Verbo regular: tong - tonged- tonged

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could tong
you could tong
he could tong
we could tong
you could tong
they could tong 	I could be tonging
you could be tonging
he could be tonging
we could be tonging
you could be tonging
they could be tonging	I could have tonged
you could have tonged
he could have tonged
we could have tonged
you could have tonged
they could have tonged	I could have been tonging
you could have been tonging
he could have been tonging
we could have been tonging
you could have been tonging
they could have been tonging	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not tong
you could not tong
he could not tong
we could not tong
you could not tong
they could not tong 	I could not be tonging
you could not be tonging
he could not be tonging
we could not be tonging
you could not be tonging
they could not be tonging	I could not have tonged
you could not have tonged
he could not have tonged
we could not have tonged
you could not have tonged
they could not have tonged	I could not have been tonging
you could not have been tonging
he could not have been tonging
we could not have been tonging
you could not have been tonging
they could not have been tonging	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I tong?
could you tong?
could he tong?
could we tong?
could you tong?
could they tong? 	could I be tonging?
could you be tonging?
could he be tonging?
could we be tonging?
could you be tonging?
could they be tonging? 	could I have tonged?
could you have tonged?
could he have tonged?
could we have tonged?
could you have tonged?
could they have tonged? 	could I have been tonging?
could you have been tonging?
could he have been tonging?
could we have been tonging?
could you have been tonging?
could they have been tonging? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not tong?
could you not tong?
could he not tong?
could we not tong?
could you not tong?
could they not tong? 	could I not be tonging?
could you not be tonging?
could he not be tonging?
could we not be tonging?
could you not be tonging?
could they not be tonging? 	could I not have tonged?
could you not have tonged?
could he not have tonged?
could we not have tonged?
could you not have tonged?
could they not have tonged? 	could I not have been tonging?
could you not have been tonging?
could he not have been tonging?
could we not have been tonging?
could you not have been tonging?
could they not have been tonging?