English verb conjugation
MUST TURN

Regular verb: turn - turned - turned

Affirmation

Simple form	V-ing form
I must turn you must turn he must turn we must turn you must turn they must turn	I must be turning you must be turning he must be turning we must be turning you must be turning they must be turning
Perfect	V-ing perfect
I must have turned you must have turned he must have turned we must have turned you must have turned they must have turned	I must have been turning you must have been turning he must have been turning we must have been turning you must have been turning they must have been turning

Negation

Simple form	V-ing form
I mustn't turn you mustn't turn he mustn't turn we mustn't turn you mustn't turn they mustn't turn	I mustn't be turning you mustn't be turning he mustn't be turning we mustn't be turning you mustn't be turning they mustn't be turning
Perfect	V-ing perfect
I mustn't have turned you mustn't have turned he mustn't have turned we mustn't have turned you mustn't have turned they mustn't have turned	I mustn't have been turning you mustn't have been turning he mustn't have been turning we mustn't have been turning you mustn't have been turning they mustn't have been turning

Interrogative form

Simple form	V-ing form
must I turn? must you turn? must he turn? must we turn? must you turn? must they turn?	must I be turning? must you be turning? must he be turning? must we be turning? must you be turning? must they be turning?
Perfect	V-ing perfect
must I have turned? must you have turned? must he have turned? must we have turned? must you have turned? must they have turned?	must I have been turning? must you have been turning? must he have been turning? must we have been turning? must you have been turning? must they have been turning?

Interro-negative form

Simple form	V-ing form
mustn't I turn? mustn't you turn? mustn't he turn? mustn't we turn? mustn't you turn? mustn't they turn?	mustn't I be turning? mustn't you be turning? mustn't he be turning? mustn't we be turning? mustn't you be turning? mustn't they be turning?
Perfect	V-ing perfect
mustn't I have turned? mustn't you have turned? mustn't he have turned? mustn't we have turned? mustn't you have turned? mustn't they have turned?	mustn't I have been turning? mustn't you have been turning? mustn't he have been turning? mustn't we have been turning? mustn't you have been turning? mustn't they have been turning?