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