must scat
Regular verb: scat - scatted- scatted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must scat
you must scat
he must scat
we must scat
you must scat
they must scat 	I must be scatting
you must be scatting
he must be scatting
we must be scatting
you must be scatting
they must be scatting	I must have scatted
you must have scatted
he must have scatted
we must have scatted
you must have scatted
they must have scatted	I must have been scatting
you must have been scatting
he must have been scatting
we must have been scatting
you must have been scatting
they must have been scatting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't scat
you mustn't scat
he mustn't scat
we mustn't scat
you mustn't scat
they mustn't scat 	I mustn't be scatting
you mustn't be scatting
he mustn't be scatting
we mustn't be scatting
you mustn't be scatting
they mustn't be scatting	I mustn't have scatted
you mustn't have scatted
he mustn't have scatted
we mustn't have scatted
you mustn't have scatted
they mustn't have scatted	I mustn't have been scatting
you mustn't have been scatting
he mustn't have been scatting
we mustn't have been scatting
you mustn't have been scatting
they mustn't have been scatting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I scat?
must you scat?
must he scat?
must we scat?
must you scat?
must they scat? 	must I be scatting?
must you be scatting?
must he be scatting?
must we be scatting?
must you be scatting?
must they be scatting? 	must I have scatted?
must you have scatted?
must he have scatted?
must we have scatted?
must you have scatted?
must they have scatted? 	must I have been scatting?
must you have been scatting?
must he have been scatting?
must we have been scatting?
must you have been scatting?
must they have been scatting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I scat?
mustn't you scat?
mustn't he scat?
mustn't we scat?
mustn't you scat?
mustn't they scat? 	mustn't I be scatting?
mustn't you be scatting?
mustn't he be scatting?
mustn't we be scatting?
mustn't you be scatting?
mustn't they be scatting? 	mustn't I have scatted?
mustn't you have scatted?
mustn't he have scatted?
mustn't we have scatted?
mustn't you have scatted?
mustn't they have scatted? 	mustn't I have been scatting?
mustn't you have been scatting?
mustn't he have been scatting?
mustn't we have been scatting?
mustn't you have been scatting?
mustn't they have been scatting?