must authorise
Regular verb: authorise - authorised- authorised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must authorise
you must authorise
she must authorise
we must authorise
you must authorise
they must authorise 	I must be authorising
you must be authorising
she must be authorising
we must be authorising
you must be authorising
they must be authorising	I must have authorised
you must have authorised
she must have authorised
we must have authorised
you must have authorised
they must have authorised	I must have been authorising
you must have been authorising
she must have been authorising
we must have been authorising
you must have been authorising
they must have been authorising	

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

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