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