I can smash you can smash he can smash we can smash you can smash they can smash
V-ing form
I can be smashing you can be smashing he can be smashing we can be smashing you can be smashing they can be smashing
Perfect
I can have smashed you can have smashed he can have smashed we can have smashed you can have smashed they can have smashed
V-ing perfect
I can have been smashing you can have been smashing he can have been smashing we can have been smashing you can have been smashing they can have been smashing
Negation
Simple form
I can't smash you can't smash he can't smash we can't smash you can't smash they can't smash
V-ing form
I can't be smashing you can't be smashing he can't be smashing we can't be smashing you can't be smashing they can't be smashing
Perfect
I can't have smashed you can't have smashed he can't have smashed we can't have smashed you can't have smashed they can't have smashed
V-ing perfect
I can't have been smashing you can't have been smashing he can't have been smashing we can't have been smashing you can't have been smashing they can't have been smashing
Interrogative form
Simple form
can I smash? can you smash? can he smash? can we smash? can you smash? can they smash?
V-ing form
can I be smashing? can you be smashing? can he be smashing? can we be smashing? can you be smashing? can they be smashing?
Perfect
can I have smashed? can you have smashed? can he have smashed? can we have smashed? can you have smashed? can they have smashed?
V-ing perfect
can I have been smashing? can you have been smashing? can he have been smashing? can we have been smashing? can you have been smashing? can they have been smashing?
Interro-negative form
Simple form
can't I smash? can't you smash? can't he smash? can't we smash? can't you smash? can't they smash?
V-ing form
can't I be smashing? can't you be smashing? can't he be smashing? can't we be smashing? can't you be smashing? can't they be smashing?
Perfect
can't I have smashed? can't you have smashed? can't he have smashed? can't we have smashed? can't you have smashed? can't they have smashed?
V-ing perfect
can't I have been smashing? can't you have been smashing? can't he have been smashing? can't we have been smashing? can't you have been smashing? can't they have been smashing?