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