could preregister
Verbo regular: preregister - preregistered- preregistered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could preregister
you could preregister
he could preregister
we could preregister
you could preregister
they could preregister 	I could be preregistering
you could be preregistering
he could be preregistering
we could be preregistering
you could be preregistering
they could be preregistering	I could have preregistered
you could have preregistered
he could have preregistered
we could have preregistered
you could have preregistered
they could have preregistered	I could have been preregistering
you could have been preregistering
he could have been preregistering
we could have been preregistering
you could have been preregistering
they could have been preregistering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not preregister
you could not preregister
he could not preregister
we could not preregister
you could not preregister
they could not preregister 	I could not be preregistering
you could not be preregistering
he could not be preregistering
we could not be preregistering
you could not be preregistering
they could not be preregistering	I could not have preregistered
you could not have preregistered
he could not have preregistered
we could not have preregistered
you could not have preregistered
they could not have preregistered	I could not have been preregistering
you could not have been preregistering
he could not have been preregistering
we could not have been preregistering
you could not have been preregistering
they could not have been preregistering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I preregister?
could you preregister?
could he preregister?
could we preregister?
could you preregister?
could they preregister? 	could I be preregistering?
could you be preregistering?
could he be preregistering?
could we be preregistering?
could you be preregistering?
could they be preregistering? 	could I have preregistered?
could you have preregistered?
could he have preregistered?
could we have preregistered?
could you have preregistered?
could they have preregistered? 	could I have been preregistering?
could you have been preregistering?
could he have been preregistering?
could we have been preregistering?
could you have been preregistering?
could they have been preregistering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not preregister?
could you not preregister?
could he not preregister?
could we not preregister?
could you not preregister?
could they not preregister? 	could I not be preregistering?
could you not be preregistering?
could he not be preregistering?
could we not be preregistering?
could you not be preregistering?
could they not be preregistering? 	could I not have preregistered?
could you not have preregistered?
could he not have preregistered?
could we not have preregistered?
could you not have preregistered?
could they not have preregistered? 	could I not have been preregistering?
could you not have been preregistering?
could he not have been preregistering?
could we not have been preregistering?
could you not have been preregistering?
could they not have been preregistering?