I must shrivel you must shrivel she must shrivel we must shrivel you must shrivel they must shrivel
V-ing form
I must be shrivelling you must be shrivelling she must be shrivelling we must be shrivelling you must be shrivelling they must be shrivelling
Perfect
I must have shrivelled you must have shrivelled she must have shrivelled we must have shrivelled you must have shrivelled they must have shrivelled
V-ing perfect
I must have been shrivelling you must have been shrivelling she must have been shrivelling we must have been shrivelling you must have been shrivelling they must have been shrivelling
Negation
Simple form
I mustn't shrivel you mustn't shrivel she mustn't shrivel we mustn't shrivel you mustn't shrivel they mustn't shrivel
V-ing form
I mustn't be shrivelling you mustn't be shrivelling she mustn't be shrivelling we mustn't be shrivelling you mustn't be shrivelling they mustn't be shrivelling
Perfect
I mustn't have shrivelled you mustn't have shrivelled she mustn't have shrivelled we mustn't have shrivelled you mustn't have shrivelled they mustn't have shrivelled
V-ing perfect
I mustn't have been shrivelling you mustn't have been shrivelling she mustn't have been shrivelling we mustn't have been shrivelling you mustn't have been shrivelling they mustn't have been shrivelling
Interrogative form
Simple form
must I shrivel? must you shrivel? must she shrivel? must we shrivel? must you shrivel? must they shrivel?
V-ing form
must I be shrivelling? must you be shrivelling? must she be shrivelling? must we be shrivelling? must you be shrivelling? must they be shrivelling?
Perfect
must I have shrivelled? must you have shrivelled? must she have shrivelled? must we have shrivelled? must you have shrivelled? must they have shrivelled?
V-ing perfect
must I have been shrivelling? must you have been shrivelling? must she have been shrivelling? must we have been shrivelling? must you have been shrivelling? must they have been shrivelling?
Interro-negative form
Simple form
mustn't I shrivel? mustn't you shrivel? mustn't she shrivel? mustn't we shrivel? mustn't you shrivel? mustn't they shrivel?
V-ing form
mustn't I be shrivelling? mustn't you be shrivelling? mustn't she be shrivelling? mustn't we be shrivelling? mustn't you be shrivelling? mustn't they be shrivelling?
Perfect
mustn't I have shrivelled? mustn't you have shrivelled? mustn't she have shrivelled? mustn't we have shrivelled? mustn't you have shrivelled? mustn't they have shrivelled?
V-ing perfect
mustn't I have been shrivelling? mustn't you have been shrivelling? mustn't she have been shrivelling? mustn't we have been shrivelling? mustn't you have been shrivelling? mustn't they have been shrivelling?