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