English verb conjugation
COULD PREWASH

Regular verb: prewash - prewashed - prewashed

Affirmation

Simple form	V-ing form
I could prewash you could prewash he could prewash we could prewash you could prewash they could prewash	I could be prewashing you could be prewashing he could be prewashing we could be prewashing you could be prewashing they could be prewashing
Perfect	V-ing perfect
I could have prewashed you could have prewashed he could have prewashed we could have prewashed you could have prewashed they could have prewashed	I could have been prewashing you could have been prewashing he could have been prewashing we could have been prewashing you could have been prewashing they could have been prewashing

Negation

Simple form	V-ing form
I could not prewash you could not prewash he could not prewash we could not prewash you could not prewash they could not prewash	I could not be prewashing you could not be prewashing he could not be prewashing we could not be prewashing you could not be prewashing they could not be prewashing
Perfect	V-ing perfect
I could not have prewashed you could not have prewashed he could not have prewashed we could not have prewashed you could not have prewashed they could not have prewashed	I could not have been prewashing you could not have been prewashing he could not have been prewashing we could not have been prewashing you could not have been prewashing they could not have been prewashing

Interrogative form

Simple form	V-ing form
could I prewash? could you prewash? could he prewash? could we prewash? could you prewash? could they prewash?	could I be prewashing? could you be prewashing? could he be prewashing? could we be prewashing? could you be prewashing? could they be prewashing?
Perfect	V-ing perfect
could I have prewashed? could you have prewashed? could he have prewashed? could we have prewashed? could you have prewashed? could they have prewashed?	could I have been prewashing? could you have been prewashing? could he have been prewashing? could we have been prewashing? could you have been prewashing? could they have been prewashing?

Interro-negative form

Simple form	V-ing form
could I not prewash? could you not prewash? could he not prewash? could we not prewash? could you not prewash? could they not prewash?	could I not be prewashing? could you not be prewashing? could he not be prewashing? could we not be prewashing? could you not be prewashing? could they not be prewashing?
Perfect	V-ing perfect
could I not have prewashed? could you not have prewashed? could he not have prewashed? could we not have prewashed? could you not have prewashed? could they not have prewashed?	could I not have been prewashing? could you not have been prewashing? could he not have been prewashing? could we not have been prewashing? could you not have been prewashing? could they not have been prewashing?