I could cash you could cash he could cash we could cash you could cash they could cash
V-ing form
I could be cashing you could be cashing he could be cashing we could be cashing you could be cashing they could be cashing
Perfect
I could have cashed you could have cashed he could have cashed we could have cashed you could have cashed they could have cashed
V-ing perfect
I could have been cashing you could have been cashing he could have been cashing we could have been cashing you could have been cashing they could have been cashing
Negation
Simple form
I couldn't cash you couldn't cash he couldn't cash we couldn't cash you couldn't cash they couldn't cash
V-ing form
I couldn't be cashing you couldn't be cashing he couldn't be cashing we couldn't be cashing you couldn't be cashing they couldn't be cashing
Perfect
I couldn't have cashed you couldn't have cashed he couldn't have cashed we couldn't have cashed you couldn't have cashed they couldn't have cashed
V-ing perfect
I couldn't have been cashing you couldn't have been cashing he couldn't have been cashing we couldn't have been cashing you couldn't have been cashing they couldn't have been cashing
Interrogative form
Simple form
could I cash? could you cash? could he cash? could we cash? could you cash? could they cash?
V-ing form
could I be cashing? could you be cashing? could he be cashing? could we be cashing? could you be cashing? could they be cashing?
Perfect
could I have cashed? could you have cashed? could he have cashed? could we have cashed? could you have cashed? could they have cashed?
V-ing perfect
could I have been cashing? could you have been cashing? could he have been cashing? could we have been cashing? could you have been cashing? could they have been cashing?
Interro-negative form
Simple form
couldn't I cash? couldn't you cash? couldn't he cash? couldn't we cash? couldn't you cash? couldn't they cash?
V-ing form
couldn't I be cashing? couldn't you be cashing? couldn't he be cashing? couldn't we be cashing? couldn't you be cashing? couldn't they be cashing?
Perfect
couldn't I have cashed? couldn't you have cashed? couldn't he have cashed? couldn't we have cashed? couldn't you have cashed? couldn't they have cashed?
V-ing perfect
couldn't I have been cashing? couldn't you have been cashing? couldn't he have been cashing? couldn't we have been cashing? couldn't you have been cashing? couldn't they have been cashing?