I could stonewash you could stonewash he could stonewash we could stonewash you could stonewash they could stonewash
V-ing form
I could be stonewashing you could be stonewashing he could be stonewashing we could be stonewashing you could be stonewashing they could be stonewashing
Perfect
I could have stonewashed you could have stonewashed he 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 he 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 he 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 he 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 he 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 he 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 he stonewash? could we stonewash? could you stonewash? could they stonewash?
V-ing form
could I be stonewashing? could you be stonewashing? could he be stonewashing? could we be stonewashing? could you be stonewashing? could they be stonewashing?
Perfect
could I have stonewashed? could you have stonewashed? could he 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 he 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 he 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 he 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 he 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 he have been stonewashing? couldn't we have been stonewashing? couldn't you have been stonewashing? couldn't they have been stonewashing?