English verb conjugation
MUST SCRATCH

Regular verb: scratch - scratched - scratched

Affirmation

Simple form	V-ing form
I must scratch you must scratch he must scratch we must scratch you must scratch they must scratch	I must be scratching you must be scratching he must be scratching we must be scratching you must be scratching they must be scratching
Perfect	V-ing perfect
I must have scratched you must have scratched he must have scratched we must have scratched you must have scratched they must have scratched	I must have been scratching you must have been scratching he must have been scratching we must have been scratching you must have been scratching they must have been scratching

Negation

Simple form	V-ing form
I mustn't scratch you mustn't scratch he mustn't scratch we mustn't scratch you mustn't scratch they mustn't scratch	I mustn't be scratching you mustn't be scratching he mustn't be scratching we mustn't be scratching you mustn't be scratching they mustn't be scratching
Perfect	V-ing perfect
I mustn't have scratched you mustn't have scratched he mustn't have scratched we mustn't have scratched you mustn't have scratched they mustn't have scratched	I mustn't have been scratching you mustn't have been scratching he mustn't have been scratching we mustn't have been scratching you mustn't have been scratching they mustn't have been scratching

Interrogative form

Simple form	V-ing form
must I scratch? must you scratch? must he scratch? must we scratch? must you scratch? must they scratch?	must I be scratching? must you be scratching? must he be scratching? must we be scratching? must you be scratching? must they be scratching?
Perfect	V-ing perfect
must I have scratched? must you have scratched? must he have scratched? must we have scratched? must you have scratched? must they have scratched?	must I have been scratching? must you have been scratching? must he have been scratching? must we have been scratching? must you have been scratching? must they have been scratching?

Interro-negative form

Simple form	V-ing form
mustn't I scratch? mustn't you scratch? mustn't he scratch? mustn't we scratch? mustn't you scratch? mustn't they scratch?	mustn't I be scratching? mustn't you be scratching? mustn't he be scratching? mustn't we be scratching? mustn't you be scratching? mustn't they be scratching?
Perfect	V-ing perfect
mustn't I have scratched? mustn't you have scratched? mustn't he have scratched? mustn't we have scratched? mustn't you have scratched? mustn't they have scratched?	mustn't I have been scratching? mustn't you have been scratching? mustn't he have been scratching? mustn't we have been scratching? mustn't you have been scratching? mustn't they have been scratching?