could hijack
Regular verb: hijack - hijacked- hijacked

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

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

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

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