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