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