English verb conjugation
MUST SMILE

Regular verb: smile - smiled - smiled

Affirmation

Simple form	V-ing form
I must smile you must smile he must smile we must smile you must smile they must smile	I must be smiling you must be smiling he must be smiling we must be smiling you must be smiling they must be smiling
Perfect	V-ing perfect
I must have smiled you must have smiled he must have smiled we must have smiled you must have smiled they must have smiled	I must have been smiling you must have been smiling he must have been smiling we must have been smiling you must have been smiling they must have been smiling

Negation

Simple form	V-ing form
I mustn't smile you mustn't smile he mustn't smile we mustn't smile you mustn't smile they mustn't smile	I mustn't be smiling you mustn't be smiling he mustn't be smiling we mustn't be smiling you mustn't be smiling they mustn't be smiling
Perfect	V-ing perfect
I mustn't have smiled you mustn't have smiled he mustn't have smiled we mustn't have smiled you mustn't have smiled they mustn't have smiled	I mustn't have been smiling you mustn't have been smiling he mustn't have been smiling we mustn't have been smiling you mustn't have been smiling they mustn't have been smiling

Interrogative form

Simple form	V-ing form
must I smile? must you smile? must he smile? must we smile? must you smile? must they smile?	must I be smiling? must you be smiling? must he be smiling? must we be smiling? must you be smiling? must they be smiling?
Perfect	V-ing perfect
must I have smiled? must you have smiled? must he have smiled? must we have smiled? must you have smiled? must they have smiled?	must I have been smiling? must you have been smiling? must he have been smiling? must we have been smiling? must you have been smiling? must they have been smiling?

Interro-negative form

Simple form	V-ing form
mustn't I smile? mustn't you smile? mustn't he smile? mustn't we smile? mustn't you smile? mustn't they smile?	mustn't I be smiling? mustn't you be smiling? mustn't he be smiling? mustn't we be smiling? mustn't you be smiling? mustn't they be smiling?
Perfect	V-ing perfect
mustn't I have smiled? mustn't you have smiled? mustn't he have smiled? mustn't we have smiled? mustn't you have smiled? mustn't they have smiled?	mustn't I have been smiling? mustn't you have been smiling? mustn't he have been smiling? mustn't we have been smiling? mustn't you have been smiling? mustn't they have been smiling?