I must administe you must administe he must administe we must administe you must administe they must administe
V-ing form
I must be administing you must be administing he must be administing we must be administing you must be administing they must be administing
Perfect
I must have administed you must have administed he must have administed we must have administed you must have administed they must have administed
V-ing perfect
I must have been administing you must have been administing he must have been administing we must have been administing you must have been administing they must have been administing
Negation
Simple form
I mustn't administe you mustn't administe he mustn't administe we mustn't administe you mustn't administe they mustn't administe
V-ing form
I mustn't be administing you mustn't be administing he mustn't be administing we mustn't be administing you mustn't be administing they mustn't be administing
Perfect
I mustn't have administed you mustn't have administed he mustn't have administed we mustn't have administed you mustn't have administed they mustn't have administed
V-ing perfect
I mustn't have been administing you mustn't have been administing he mustn't have been administing we mustn't have been administing you mustn't have been administing they mustn't have been administing
Interrogative form
Simple form
must I administe? must you administe? must he administe? must we administe? must you administe? must they administe?
V-ing form
must I be administing? must you be administing? must he be administing? must we be administing? must you be administing? must they be administing?
Perfect
must I have administed? must you have administed? must he have administed? must we have administed? must you have administed? must they have administed?
V-ing perfect
must I have been administing? must you have been administing? must he have been administing? must we have been administing? must you have been administing? must they have been administing?
Interro-negative form
Simple form
mustn't I administe? mustn't you administe? mustn't he administe? mustn't we administe? mustn't you administe? mustn't they administe?
V-ing form
mustn't I be administing? mustn't you be administing? mustn't he be administing? mustn't we be administing? mustn't you be administing? mustn't they be administing?
Perfect
mustn't I have administed? mustn't you have administed? mustn't he have administed? mustn't we have administed? mustn't you have administed? mustn't they have administed?
V-ing perfect
mustn't I have been administing? mustn't you have been administing? mustn't he have been administing? mustn't we have been administing? mustn't you have been administing? mustn't they have been administing?