must authorise
Regular verb: authorise - authorised- authorised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must authorise
you must authorise
he must authorise
we must authorise
you must authorise
they must authorise 	I must be authorising
you must be authorising
he must be authorising
we must be authorising
you must be authorising
they must be authorising	I must have authorised
you must have authorised
he 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
he 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 must not authorise
you must not authorise
he must not authorise
we must not authorise
you must not authorise
they must not authorise 	I must not be authorising
you must not be authorising
he must not be authorising
we must not be authorising
you must not be authorising
they must not be authorising	I must not have authorised
you must not have authorised
he must not have authorised
we must not have authorised
you must not have authorised
they must not have authorised	I must not have been authorising
you must not have been authorising
he must not have been authorising
we must not have been authorising
you must not have been authorising
they must not have been authorising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I authorise?
must you authorise?
must he authorise?
must we authorise?
must you authorise?
must they authorise? 	must I be authorising?
must you be authorising?
must he be authorising?
must we be authorising?
must you be authorising?
must they be authorising? 	must I have authorised?
must you have authorised?
must he 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 he 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 	
must I not authorise?
must you not authorise?
must he not authorise?
must we not authorise?
must you not authorise?
must they not authorise? 	must I not be authorising?
must you not be authorising?
must he not be authorising?
must we not be authorising?
must you not be authorising?
must they not be authorising? 	must I not have authorised?
must you not have authorised?
must he not have authorised?
must we not have authorised?
must you not have authorised?
must they not have authorised? 	must I not have been authorising?
must you not have been authorising?
must he not have been authorising?
must we not have been authorising?
must you not have been authorising?
must they not have been authorising?