must hijack
Regular verb: hijack - hijacked- hijacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must hijack
you must hijack
he must hijack
we must hijack
you must hijack
they must hijack 	I must be hijacking
you must be hijacking
he must be hijacking
we must be hijacking
you must be hijacking
they must be hijacking	I must have hijacked
you must have hijacked
he must have hijacked
we must have hijacked
you must have hijacked
they must have hijacked	I must have been hijacking
you must have been hijacking
he must have been hijacking
we must have been hijacking
you must have been hijacking
they must have been hijacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't hijack
you mustn't hijack
he mustn't hijack
we mustn't hijack
you mustn't hijack
they mustn't hijack 	I mustn't be hijacking
you mustn't be hijacking
he mustn't be hijacking
we mustn't be hijacking
you mustn't be hijacking
they mustn't be hijacking	I mustn't have hijacked
you mustn't have hijacked
he mustn't have hijacked
we mustn't have hijacked
you mustn't have hijacked
they mustn't have hijacked	I mustn't have been hijacking
you mustn't have been hijacking
he mustn't have been hijacking
we mustn't have been hijacking
you mustn't have been hijacking
they mustn't have been hijacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I hijack?
must you hijack?
must he hijack?
must we hijack?
must you hijack?
must they hijack? 	must I be hijacking?
must you be hijacking?
must he be hijacking?
must we be hijacking?
must you be hijacking?
must they be hijacking? 	must I have hijacked?
must you have hijacked?
must he have hijacked?
must we have hijacked?
must you have hijacked?
must they have hijacked? 	must I have been hijacking?
must you have been hijacking?
must he have been hijacking?
must we have been hijacking?
must you have been hijacking?
must they have been hijacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I hijack?
mustn't you hijack?
mustn't he hijack?
mustn't we hijack?
mustn't you hijack?
mustn't they hijack? 	mustn't I be hijacking?
mustn't you be hijacking?
mustn't he be hijacking?
mustn't we be hijacking?
mustn't you be hijacking?
mustn't they be hijacking? 	mustn't I have hijacked?
mustn't you have hijacked?
mustn't he have hijacked?
mustn't we have hijacked?
mustn't you have hijacked?
mustn't they have hijacked? 	mustn't I have been hijacking?
mustn't you have been hijacking?
mustn't he have been hijacking?
mustn't we have been hijacking?
mustn't you have been hijacking?
mustn't they have been hijacking?