I could smash you could smash she could smash we could smash you could smash they could smash
V-ing form
I could be smashing you could be smashing she could be smashing we could be smashing you could be smashing they could be smashing
Perfect
I could have smashed you could have smashed she could have smashed we could have smashed you could have smashed they could have smashed
V-ing perfect
I could have been smashing you could have been smashing she could have been smashing we could have been smashing you could have been smashing they could have been smashing
Negation
Simple form
I could not smash you could not smash she could not smash we could not smash you could not smash they could not smash
V-ing form
I could not be smashing you could not be smashing she could not be smashing we could not be smashing you could not be smashing they could not be smashing
Perfect
I could not have smashed you could not have smashed she could not have smashed we could not have smashed you could not have smashed they could not have smashed
V-ing perfect
I could not have been smashing you could not have been smashing she could not have been smashing we could not have been smashing you could not have been smashing they could not have been smashing
Interrogative form
Simple form
could I smash? could you smash? could she smash? could we smash? could you smash? could they smash?
V-ing form
could I be smashing? could you be smashing? could she be smashing? could we be smashing? could you be smashing? could they be smashing?
Perfect
could I have smashed? could you have smashed? could she have smashed? could we have smashed? could you have smashed? could they have smashed?
V-ing perfect
could I have been smashing? could you have been smashing? could she have been smashing? could we have been smashing? could you have been smashing? could they have been smashing?
Interro-negative form
Simple form
could I not smash? could you not smash? could she not smash? could we not smash? could you not smash? could they not smash?
V-ing form
could I not be smashing? could you not be smashing? could she not be smashing? could we not be smashing? could you not be smashing? could they not be smashing?
Perfect
could I not have smashed? could you not have smashed? could she not have smashed? could we not have smashed? could you not have smashed? could they not have smashed?
V-ing perfect
could I not have been smashing? could you not have been smashing? could she not have been smashing? could we not have been smashing? could you not have been smashing? could they not have been smashing?