must scratch
Regular verb: scratch - scratched- scratched

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