could prework
Verbo regular: prework - preworked- preworked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could prework
you could prework
he could prework
we could prework
you could prework
they could prework 	I could be preworking
you could be preworking
he could be preworking
we could be preworking
you could be preworking
they could be preworking	I could have preworked
you could have preworked
he could have preworked
we could have preworked
you could have preworked
they could have preworked	I could have been preworking
you could have been preworking
he could have been preworking
we could have been preworking
you could have been preworking
they could have been preworking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not prework
you could not prework
he could not prework
we could not prework
you could not prework
they could not prework 	I could not be preworking
you could not be preworking
he could not be preworking
we could not be preworking
you could not be preworking
they could not be preworking	I could not have preworked
you could not have preworked
he could not have preworked
we could not have preworked
you could not have preworked
they could not have preworked	I could not have been preworking
you could not have been preworking
he could not have been preworking
we could not have been preworking
you could not have been preworking
they could not have been preworking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I prework?
could you prework?
could he prework?
could we prework?
could you prework?
could they prework? 	could I be preworking?
could you be preworking?
could he be preworking?
could we be preworking?
could you be preworking?
could they be preworking? 	could I have preworked?
could you have preworked?
could he have preworked?
could we have preworked?
could you have preworked?
could they have preworked? 	could I have been preworking?
could you have been preworking?
could he have been preworking?
could we have been preworking?
could you have been preworking?
could they have been preworking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not prework?
could you not prework?
could he not prework?
could we not prework?
could you not prework?
could they not prework? 	could I not be preworking?
could you not be preworking?
could he not be preworking?
could we not be preworking?
could you not be preworking?
could they not be preworking? 	could I not have preworked?
could you not have preworked?
could he not have preworked?
could we not have preworked?
could you not have preworked?
could they not have preworked? 	could I not have been preworking?
could you not have been preworking?
could he not have been preworking?
could we not have been preworking?
could you not have been preworking?
could they not have been preworking?