must copyright
Regular verb: copyright - copyrighted- copyrighted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must copyright
you must copyright
he must copyright
we must copyright
you must copyright
they must copyright 	I must be copyrighting
you must be copyrighting
he must be copyrighting
we must be copyrighting
you must be copyrighting
they must be copyrighting	I must have copyrighted
you must have copyrighted
he must have copyrighted
we must have copyrighted
you must have copyrighted
they must have copyrighted	I must have been copyrighting
you must have been copyrighting
he must have been copyrighting
we must have been copyrighting
you must have been copyrighting
they must have been copyrighting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't copyright
you mustn't copyright
he mustn't copyright
we mustn't copyright
you mustn't copyright
they mustn't copyright 	I mustn't be copyrighting
you mustn't be copyrighting
he mustn't be copyrighting
we mustn't be copyrighting
you mustn't be copyrighting
they mustn't be copyrighting	I mustn't have copyrighted
you mustn't have copyrighted
he mustn't have copyrighted
we mustn't have copyrighted
you mustn't have copyrighted
they mustn't have copyrighted	I mustn't have been copyrighting
you mustn't have been copyrighting
he mustn't have been copyrighting
we mustn't have been copyrighting
you mustn't have been copyrighting
they mustn't have been copyrighting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I copyright?
must you copyright?
must he copyright?
must we copyright?
must you copyright?
must they copyright? 	must I be copyrighting?
must you be copyrighting?
must he be copyrighting?
must we be copyrighting?
must you be copyrighting?
must they be copyrighting? 	must I have copyrighted?
must you have copyrighted?
must he have copyrighted?
must we have copyrighted?
must you have copyrighted?
must they have copyrighted? 	must I have been copyrighting?
must you have been copyrighting?
must he have been copyrighting?
must we have been copyrighting?
must you have been copyrighting?
must they have been copyrighting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I copyright?
mustn't you copyright?
mustn't he copyright?
mustn't we copyright?
mustn't you copyright?
mustn't they copyright? 	mustn't I be copyrighting?
mustn't you be copyrighting?
mustn't he be copyrighting?
mustn't we be copyrighting?
mustn't you be copyrighting?
mustn't they be copyrighting? 	mustn't I have copyrighted?
mustn't you have copyrighted?
mustn't he have copyrighted?
mustn't we have copyrighted?
mustn't you have copyrighted?
mustn't they have copyrighted? 	mustn't I have been copyrighting?
mustn't you have been copyrighting?
mustn't he have been copyrighting?
mustn't we have been copyrighting?
mustn't you have been copyrighting?
mustn't they have been copyrighting?