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