I must demagnetise you must demagnetise she must demagnetise we must demagnetise you must demagnetise they must demagnetise
V-ing form
I must be demagnetising you must be demagnetising she must be demagnetising we must be demagnetising you must be demagnetising they must be demagnetising
Perfect
I must have demagnetised you must have demagnetised she must have demagnetised we must have demagnetised you must have demagnetised they must have demagnetised
V-ing perfect
I must have been demagnetising you must have been demagnetising she must have been demagnetising we must have been demagnetising you must have been demagnetising they must have been demagnetising
Negation
Simple form
I mustn't demagnetise you mustn't demagnetise she mustn't demagnetise we mustn't demagnetise you mustn't demagnetise they mustn't demagnetise
V-ing form
I mustn't be demagnetising you mustn't be demagnetising she mustn't be demagnetising we mustn't be demagnetising you mustn't be demagnetising they mustn't be demagnetising
Perfect
I mustn't have demagnetised you mustn't have demagnetised she mustn't have demagnetised we mustn't have demagnetised you mustn't have demagnetised they mustn't have demagnetised
V-ing perfect
I mustn't have been demagnetising you mustn't have been demagnetising she mustn't have been demagnetising we mustn't have been demagnetising you mustn't have been demagnetising they mustn't have been demagnetising
Interrogative form
Simple form
must I demagnetise? must you demagnetise? must she demagnetise? must we demagnetise? must you demagnetise? must they demagnetise?
V-ing form
must I be demagnetising? must you be demagnetising? must she be demagnetising? must we be demagnetising? must you be demagnetising? must they be demagnetising?
Perfect
must I have demagnetised? must you have demagnetised? must she have demagnetised? must we have demagnetised? must you have demagnetised? must they have demagnetised?
V-ing perfect
must I have been demagnetising? must you have been demagnetising? must she have been demagnetising? must we have been demagnetising? must you have been demagnetising? must they have been demagnetising?
Interro-negative form
Simple form
mustn't I demagnetise? mustn't you demagnetise? mustn't she demagnetise? mustn't we demagnetise? mustn't you demagnetise? mustn't they demagnetise?
V-ing form
mustn't I be demagnetising? mustn't you be demagnetising? mustn't she be demagnetising? mustn't we be demagnetising? mustn't you be demagnetising? mustn't they be demagnetising?
Perfect
mustn't I have demagnetised? mustn't you have demagnetised? mustn't she have demagnetised? mustn't we have demagnetised? mustn't you have demagnetised? mustn't they have demagnetised?
V-ing perfect
mustn't I have been demagnetising? mustn't you have been demagnetising? mustn't she have been demagnetising? mustn't we have been demagnetising? mustn't you have been demagnetising? mustn't they have been demagnetising?