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