English verb conjugation
COULD PREWORK

Regular verb: prework - preworked - preworked

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?