could burp
Verbo regular: burp - burped- burped

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could burp
you could burp
he could burp
we could burp
you could burp
they could burp 	I could be burping
you could be burping
he could be burping
we could be burping
you could be burping
they could be burping	I could have burped
you could have burped
he could have burped
we could have burped
you could have burped
they could have burped	I could have been burping
you could have been burping
he could have been burping
we could have been burping
you could have been burping
they could have been burping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not burp
you could not burp
he could not burp
we could not burp
you could not burp
they could not burp 	I could not be burping
you could not be burping
he could not be burping
we could not be burping
you could not be burping
they could not be burping	I could not have burped
you could not have burped
he could not have burped
we could not have burped
you could not have burped
they could not have burped	I could not have been burping
you could not have been burping
he could not have been burping
we could not have been burping
you could not have been burping
they could not have been burping	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I burp?
could you burp?
could he burp?
could we burp?
could you burp?
could they burp? 	could I be burping?
could you be burping?
could he be burping?
could we be burping?
could you be burping?
could they be burping? 	could I have burped?
could you have burped?
could he have burped?
could we have burped?
could you have burped?
could they have burped? 	could I have been burping?
could you have been burping?
could he have been burping?
could we have been burping?
could you have been burping?
could they have been burping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not burp?
could you not burp?
could he not burp?
could we not burp?
could you not burp?
could they not burp? 	could I not be burping?
could you not be burping?
could he not be burping?
could we not be burping?
could you not be burping?
could they not be burping? 	could I not have burped?
could you not have burped?
could he not have burped?
could we not have burped?
could you not have burped?
could they not have burped? 	could I not have been burping?
could you not have been burping?
could he not have been burping?
could we not have been burping?
could you not have been burping?
could they not have been burping?