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