I could smash you could smash he could smash we could smash you could smash they could smash
V-ing form
I could be smashing you could be smashing he could be smashing we could be smashing you could be smashing they could be smashing
Perfect
I could have smashed you could have smashed he 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 he 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 he 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 he 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 he 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 he 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 he smash? could we smash? could you smash? could they smash?
V-ing form
could I be smashing? could you be smashing? could he be smashing? could we be smashing? could you be smashing? could they be smashing?
Perfect
could I have smashed? could you have smashed? could he 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 he 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 he 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 he 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 he 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 he not have been smashing? could we not have been smashing? could you not have been smashing? could they not have been smashing?