I could trash you could trash he could trash we could trash you could trash they could trash
V-ing form
I could be trashing you could be trashing he could be trashing we could be trashing you could be trashing they could be trashing
Perfect
I could have trashed you could have trashed he could have trashed we could have trashed you could have trashed they could have trashed
V-ing perfect
I could have been trashing you could have been trashing he could have been trashing we could have been trashing you could have been trashing they could have been trashing
Negation
Simple form
I could not trash you could not trash he could not trash we could not trash you could not trash they could not trash
V-ing form
I could not be trashing you could not be trashing he could not be trashing we could not be trashing you could not be trashing they could not be trashing
Perfect
I could not have trashed you could not have trashed he could not have trashed we could not have trashed you could not have trashed they could not have trashed
V-ing perfect
I could not have been trashing you could not have been trashing he could not have been trashing we could not have been trashing you could not have been trashing they could not have been trashing
Interrogative form
Simple form
could I trash? could you trash? could he trash? could we trash? could you trash? could they trash?
V-ing form
could I be trashing? could you be trashing? could he be trashing? could we be trashing? could you be trashing? could they be trashing?
Perfect
could I have trashed? could you have trashed? could he have trashed? could we have trashed? could you have trashed? could they have trashed?
V-ing perfect
could I have been trashing? could you have been trashing? could he have been trashing? could we have been trashing? could you have been trashing? could they have been trashing?
Interro-negative form
Simple form
could I not trash? could you not trash? could he not trash? could we not trash? could you not trash? could they not trash?
V-ing form
could I not be trashing? could you not be trashing? could he not be trashing? could we not be trashing? could you not be trashing? could they not be trashing?
Perfect
could I not have trashed? could you not have trashed? could he not have trashed? could we not have trashed? could you not have trashed? could they not have trashed?
V-ing perfect
could I not have been trashing? could you not have been trashing? could he not have been trashing? could we not have been trashing? could you not have been trashing? could they not have been trashing?