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