must degauss
Regular verb: degauss - degaussed- degaussed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must degauss
you must degauss
she must degauss
we must degauss
you must degauss
they must degauss 	I must be degaussing
you must be degaussing
she must be degaussing
we must be degaussing
you must be degaussing
they must be degaussing	I must have degaussed
you must have degaussed
she must have degaussed
we must have degaussed
you must have degaussed
they must have degaussed	I must have been degaussing
you must have been degaussing
she must have been degaussing
we must have been degaussing
you must have been degaussing
they must have been degaussing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't degauss
you mustn't degauss
she mustn't degauss
we mustn't degauss
you mustn't degauss
they mustn't degauss 	I mustn't be degaussing
you mustn't be degaussing
she mustn't be degaussing
we mustn't be degaussing
you mustn't be degaussing
they mustn't be degaussing	I mustn't have degaussed
you mustn't have degaussed
she mustn't have degaussed
we mustn't have degaussed
you mustn't have degaussed
they mustn't have degaussed	I mustn't have been degaussing
you mustn't have been degaussing
she mustn't have been degaussing
we mustn't have been degaussing
you mustn't have been degaussing
they mustn't have been degaussing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I degauss?
must you degauss?
must she degauss?
must we degauss?
must you degauss?
must they degauss? 	must I be degaussing?
must you be degaussing?
must she be degaussing?
must we be degaussing?
must you be degaussing?
must they be degaussing? 	must I have degaussed?
must you have degaussed?
must she have degaussed?
must we have degaussed?
must you have degaussed?
must they have degaussed? 	must I have been degaussing?
must you have been degaussing?
must she have been degaussing?
must we have been degaussing?
must you have been degaussing?
must they have been degaussing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I degauss?
mustn't you degauss?
mustn't she degauss?
mustn't we degauss?
mustn't you degauss?
mustn't they degauss? 	mustn't I be degaussing?
mustn't you be degaussing?
mustn't she be degaussing?
mustn't we be degaussing?
mustn't you be degaussing?
mustn't they be degaussing? 	mustn't I have degaussed?
mustn't you have degaussed?
mustn't she have degaussed?
mustn't we have degaussed?
mustn't you have degaussed?
mustn't they have degaussed? 	mustn't I have been degaussing?
mustn't you have been degaussing?
mustn't she have been degaussing?
mustn't we have been degaussing?
mustn't you have been degaussing?
mustn't they have been degaussing?