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