I could stonewash you could stonewash she could stonewash we could stonewash you could stonewash they could stonewash
V-ing form
I could be stonewashing you could be stonewashing she could be stonewashing we could be stonewashing you could be stonewashing they could be stonewashing
Perfect
I could have stonewashed you could have stonewashed she could have stonewashed we could have stonewashed you could have stonewashed they could have stonewashed
V-ing perfect
I could have been stonewashing you could have been stonewashing she could have been stonewashing we could have been stonewashing you could have been stonewashing they could have been stonewashing
Negation
Simple form
I couldn't stonewash you couldn't stonewash she couldn't stonewash we couldn't stonewash you couldn't stonewash they couldn't stonewash
V-ing form
I couldn't be stonewashing you couldn't be stonewashing she couldn't be stonewashing we couldn't be stonewashing you couldn't be stonewashing they couldn't be stonewashing
Perfect
I couldn't have stonewashed you couldn't have stonewashed she couldn't have stonewashed we couldn't have stonewashed you couldn't have stonewashed they couldn't have stonewashed
V-ing perfect
I couldn't have been stonewashing you couldn't have been stonewashing she couldn't have been stonewashing we couldn't have been stonewashing you couldn't have been stonewashing they couldn't have been stonewashing
Interrogative form
Simple form
could I stonewash? could you stonewash? could she stonewash? could we stonewash? could you stonewash? could they stonewash?
V-ing form
could I be stonewashing? could you be stonewashing? could she be stonewashing? could we be stonewashing? could you be stonewashing? could they be stonewashing?
Perfect
could I have stonewashed? could you have stonewashed? could she have stonewashed? could we have stonewashed? could you have stonewashed? could they have stonewashed?
V-ing perfect
could I have been stonewashing? could you have been stonewashing? could she have been stonewashing? could we have been stonewashing? could you have been stonewashing? could they have been stonewashing?
Interro-negative form
Simple form
couldn't I stonewash? couldn't you stonewash? couldn't she stonewash? couldn't we stonewash? couldn't you stonewash? couldn't they stonewash?
V-ing form
couldn't I be stonewashing? couldn't you be stonewashing? couldn't she be stonewashing? couldn't we be stonewashing? couldn't you be stonewashing? couldn't they be stonewashing?
Perfect
couldn't I have stonewashed? couldn't you have stonewashed? couldn't she have stonewashed? couldn't we have stonewashed? couldn't you have stonewashed? couldn't they have stonewashed?
V-ing perfect
couldn't I have been stonewashing? couldn't you have been stonewashing? couldn't she have been stonewashing? couldn't we have been stonewashing? couldn't you have been stonewashing? couldn't they have been stonewashing?