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