I must smoke you must smoke he must smoke we must smoke you must smoke they must smoke
V-ing form
I must be smoking you must be smoking he must be smoking we must be smoking you must be smoking they must be smoking
Perfect
I must have smoked you must have smoked he must have smoked we must have smoked you must have smoked they must have smoked
V-ing perfect
I must have been smoking you must have been smoking he must have been smoking we must have been smoking you must have been smoking they must have been smoking
Negation
Simple form
I must not smoke you must not smoke he must not smoke we must not smoke you must not smoke they must not smoke
V-ing form
I must not be smoking you must not be smoking he must not be smoking we must not be smoking you must not be smoking they must not be smoking
Perfect
I must not have smoked you must not have smoked he must not have smoked we must not have smoked you must not have smoked they must not have smoked
V-ing perfect
I must not have been smoking you must not have been smoking he must not have been smoking we must not have been smoking you must not have been smoking they must not have been smoking
Interrogative form
Simple form
must I smoke? must you smoke? must he smoke? must we smoke? must you smoke? must they smoke?
V-ing form
must I be smoking? must you be smoking? must he be smoking? must we be smoking? must you be smoking? must they be smoking?
Perfect
must I have smoked? must you have smoked? must he have smoked? must we have smoked? must you have smoked? must they have smoked?
V-ing perfect
must I have been smoking? must you have been smoking? must he have been smoking? must we have been smoking? must you have been smoking? must they have been smoking?
Interro-negative form
Simple form
must I not smoke? must you not smoke? must he not smoke? must we not smoke? must you not smoke? must they not smoke?
V-ing form
must I not be smoking? must you not be smoking? must he not be smoking? must we not be smoking? must you not be smoking? must they not be smoking?
Perfect
must I not have smoked? must you not have smoked? must he not have smoked? must we not have smoked? must you not have smoked? must they not have smoked?
V-ing perfect
must I not have been smoking? must you not have been smoking? must he not have been smoking? must we not have been smoking? must you not have been smoking? must they not have been smoking?