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