could overbill
Verbo regular: overbill - overbilled- overbilled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could overbill
you could overbill
he could overbill
we could overbill
you could overbill
they could overbill 	I could be overbilling
you could be overbilling
he could be overbilling
we could be overbilling
you could be overbilling
they could be overbilling	I could have overbilled
you could have overbilled
he could have overbilled
we could have overbilled
you could have overbilled
they could have overbilled	I could have been overbilling
you could have been overbilling
he could have been overbilling
we could have been overbilling
you could have been overbilling
they could have been overbilling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not overbill
you could not overbill
he could not overbill
we could not overbill
you could not overbill
they could not overbill 	I could not be overbilling
you could not be overbilling
he could not be overbilling
we could not be overbilling
you could not be overbilling
they could not be overbilling	I could not have overbilled
you could not have overbilled
he could not have overbilled
we could not have overbilled
you could not have overbilled
they could not have overbilled	I could not have been overbilling
you could not have been overbilling
he could not have been overbilling
we could not have been overbilling
you could not have been overbilling
they could not have been overbilling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I overbill?
could you overbill?
could he overbill?
could we overbill?
could you overbill?
could they overbill? 	could I be overbilling?
could you be overbilling?
could he be overbilling?
could we be overbilling?
could you be overbilling?
could they be overbilling? 	could I have overbilled?
could you have overbilled?
could he have overbilled?
could we have overbilled?
could you have overbilled?
could they have overbilled? 	could I have been overbilling?
could you have been overbilling?
could he have been overbilling?
could we have been overbilling?
could you have been overbilling?
could they have been overbilling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not overbill?
could you not overbill?
could he not overbill?
could we not overbill?
could you not overbill?
could they not overbill? 	could I not be overbilling?
could you not be overbilling?
could he not be overbilling?
could we not be overbilling?
could you not be overbilling?
could they not be overbilling? 	could I not have overbilled?
could you not have overbilled?
could he not have overbilled?
could we not have overbilled?
could you not have overbilled?
could they not have overbilled? 	could I not have been overbilling?
could you not have been overbilling?
could he not have been overbilling?
could we not have been overbilling?
could you not have been overbilling?
could they not have been overbilling?