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