English verb conjugation
COULD PREWASH

Regular verb: prewash - prewashed - prewashed

Affirmation

Simple form	V-ing form
I could prewash you could prewash she could prewash we could prewash you could prewash they could prewash	I could be prewashing you could be prewashing she 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 she 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 she 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 couldn't prewash you couldn't prewash she couldn't prewash we couldn't prewash you couldn't prewash they couldn't prewash	I couldn't be prewashing you couldn't be prewashing she couldn't be prewashing we couldn't be prewashing you couldn't be prewashing they couldn't be prewashing
Perfect	V-ing perfect
I couldn't have prewashed you couldn't have prewashed she couldn't have prewashed we couldn't have prewashed you couldn't have prewashed they couldn't have prewashed	I couldn't have been prewashing you couldn't have been prewashing she couldn't have been prewashing we couldn't have been prewashing you couldn't have been prewashing they couldn't have been prewashing

Interrogative form

Simple form	V-ing form
could I prewash? could you prewash? could she prewash? could we prewash? could you prewash? could they prewash?	could I be prewashing? could you be prewashing? could she 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 she 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 she 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
couldn't I prewash? couldn't you prewash? couldn't she prewash? couldn't we prewash? couldn't you prewash? couldn't they prewash?	couldn't I be prewashing? couldn't you be prewashing? couldn't she be prewashing? couldn't we be prewashing? couldn't you be prewashing? couldn't they be prewashing?
Perfect	V-ing perfect
couldn't I have prewashed? couldn't you have prewashed? couldn't she have prewashed? couldn't we have prewashed? couldn't you have prewashed? couldn't they have prewashed?	couldn't I have been prewashing? couldn't you have been prewashing? couldn't she have been prewashing? couldn't we have been prewashing? couldn't you have been prewashing? couldn't they have been prewashing?