could pong
Verbo regular: pong - ponged- ponged

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could pong
you could pong
he could pong
we could pong
you could pong
they could pong 	I could be ponging
you could be ponging
he could be ponging
we could be ponging
you could be ponging
they could be ponging	I could have ponged
you could have ponged
he could have ponged
we could have ponged
you could have ponged
they could have ponged	I could have been ponging
you could have been ponging
he could have been ponging
we could have been ponging
you could have been ponging
they could have been ponging	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not pong
you could not pong
he could not pong
we could not pong
you could not pong
they could not pong 	I could not be ponging
you could not be ponging
he could not be ponging
we could not be ponging
you could not be ponging
they could not be ponging	I could not have ponged
you could not have ponged
he could not have ponged
we could not have ponged
you could not have ponged
they could not have ponged	I could not have been ponging
you could not have been ponging
he could not have been ponging
we could not have been ponging
you could not have been ponging
they could not have been ponging	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I pong?
could you pong?
could he pong?
could we pong?
could you pong?
could they pong? 	could I be ponging?
could you be ponging?
could he be ponging?
could we be ponging?
could you be ponging?
could they be ponging? 	could I have ponged?
could you have ponged?
could he have ponged?
could we have ponged?
could you have ponged?
could they have ponged? 	could I have been ponging?
could you have been ponging?
could he have been ponging?
could we have been ponging?
could you have been ponging?
could they have been ponging? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not pong?
could you not pong?
could he not pong?
could we not pong?
could you not pong?
could they not pong? 	could I not be ponging?
could you not be ponging?
could he not be ponging?
could we not be ponging?
could you not be ponging?
could they not be ponging? 	could I not have ponged?
could you not have ponged?
could he not have ponged?
could we not have ponged?
could you not have ponged?
could they not have ponged? 	could I not have been ponging?
could you not have been ponging?
could he not have been ponging?
could we not have been ponging?
could you not have been ponging?
could they not have been ponging?