could auction
Verbo regular: auction - auctioned- auctioned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could auction
you could auction
he could auction
we could auction
you could auction
they could auction 	I could be auctioning
you could be auctioning
he could be auctioning
we could be auctioning
you could be auctioning
they could be auctioning	I could have auctioned
you could have auctioned
he could have auctioned
we could have auctioned
you could have auctioned
they could have auctioned	I could have been auctioning
you could have been auctioning
he could have been auctioning
we could have been auctioning
you could have been auctioning
they could have been auctioning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not auction
you could not auction
he could not auction
we could not auction
you could not auction
they could not auction 	I could not be auctioning
you could not be auctioning
he could not be auctioning
we could not be auctioning
you could not be auctioning
they could not be auctioning	I could not have auctioned
you could not have auctioned
he could not have auctioned
we could not have auctioned
you could not have auctioned
they could not have auctioned	I could not have been auctioning
you could not have been auctioning
he could not have been auctioning
we could not have been auctioning
you could not have been auctioning
they could not have been auctioning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I auction?
could you auction?
could he auction?
could we auction?
could you auction?
could they auction? 	could I be auctioning?
could you be auctioning?
could he be auctioning?
could we be auctioning?
could you be auctioning?
could they be auctioning? 	could I have auctioned?
could you have auctioned?
could he have auctioned?
could we have auctioned?
could you have auctioned?
could they have auctioned? 	could I have been auctioning?
could you have been auctioning?
could he have been auctioning?
could we have been auctioning?
could you have been auctioning?
could they have been auctioning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not auction?
could you not auction?
could he not auction?
could we not auction?
could you not auction?
could they not auction? 	could I not be auctioning?
could you not be auctioning?
could he not be auctioning?
could we not be auctioning?
could you not be auctioning?
could they not be auctioning? 	could I not have auctioned?
could you not have auctioned?
could he not have auctioned?
could we not have auctioned?
could you not have auctioned?
could they not have auctioned? 	could I not have been auctioning?
could you not have been auctioning?
could he not have been auctioning?
could we not have been auctioning?
could you not have been auctioning?
could they not have been auctioning?