I must slit you must slit he must slit we must slit you must slit they must slit
V-ing form
I must be slitting you must be slitting he must be slitting we must be slitting you must be slitting they must be slitting
Perfect
I must have slit you must have slit he 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 he must have been slitting we must have been slitting you must have been slitting they must have been slitting
Negation
Simple form
I must not slit you must not slit he must not slit we must not slit you must not slit they must not slit
V-ing form
I must not be slitting you must not be slitting he must not be slitting we must not be slitting you must not be slitting they must not be slitting
Perfect
I must not have slit you must not have slit he must not have slit we must not have slit you must not have slit they must not have slit
V-ing perfect
I must not have been slitting you must not have been slitting he must not have been slitting we must not have been slitting you must not have been slitting they must not have been slitting
Interrogative form
Simple form
must I slit? must you slit? must he slit? must we slit? must you slit? must they slit?
V-ing form
must I be slitting? must you be slitting? must he be slitting? must we be slitting? must you be slitting? must they be slitting?
Perfect
must I have slit? must you have slit? must he 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 he have been slitting? must we have been slitting? must you have been slitting? must they have been slitting?
Interro-negative form
Simple form
must I not slit? must you not slit? must he not slit? must we not slit? must you not slit? must they not slit?
V-ing form
must I not be slitting? must you not be slitting? must he not be slitting? must we not be slitting? must you not be slitting? must they not be slitting?
Perfect
must I not have slit? must you not have slit? must he not have slit? must we not have slit? must you not have slit? must they not have slit?
V-ing perfect
must I not have been slitting? must you not have been slitting? must he not have been slitting? must we not have been slitting? must you not have been slitting? must they not have been slitting?