must chapter
Regular verb: chapter - chaptered- chaptered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must chapter
you must chapter
she must chapter
we must chapter
you must chapter
they must chapter 	I must be chaptering
you must be chaptering
she must be chaptering
we must be chaptering
you must be chaptering
they must be chaptering	I must have chaptered
you must have chaptered
she must have chaptered
we must have chaptered
you must have chaptered
they must have chaptered	I must have been chaptering
you must have been chaptering
she must have been chaptering
we must have been chaptering
you must have been chaptering
they must have been chaptering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't chapter
you mustn't chapter
she mustn't chapter
we mustn't chapter
you mustn't chapter
they mustn't chapter 	I mustn't be chaptering
you mustn't be chaptering
she mustn't be chaptering
we mustn't be chaptering
you mustn't be chaptering
they mustn't be chaptering	I mustn't have chaptered
you mustn't have chaptered
she mustn't have chaptered
we mustn't have chaptered
you mustn't have chaptered
they mustn't have chaptered	I mustn't have been chaptering
you mustn't have been chaptering
she mustn't have been chaptering
we mustn't have been chaptering
you mustn't have been chaptering
they mustn't have been chaptering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I chapter?
must you chapter?
must she chapter?
must we chapter?
must you chapter?
must they chapter? 	must I be chaptering?
must you be chaptering?
must she be chaptering?
must we be chaptering?
must you be chaptering?
must they be chaptering? 	must I have chaptered?
must you have chaptered?
must she have chaptered?
must we have chaptered?
must you have chaptered?
must they have chaptered? 	must I have been chaptering?
must you have been chaptering?
must she have been chaptering?
must we have been chaptering?
must you have been chaptering?
must they have been chaptering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I chapter?
mustn't you chapter?
mustn't she chapter?
mustn't we chapter?
mustn't you chapter?
mustn't they chapter? 	mustn't I be chaptering?
mustn't you be chaptering?
mustn't she be chaptering?
mustn't we be chaptering?
mustn't you be chaptering?
mustn't they be chaptering? 	mustn't I have chaptered?
mustn't you have chaptered?
mustn't she have chaptered?
mustn't we have chaptered?
mustn't you have chaptered?
mustn't they have chaptered? 	mustn't I have been chaptering?
mustn't you have been chaptering?
mustn't she have been chaptering?
mustn't we have been chaptering?
mustn't you have been chaptering?
mustn't they have been chaptering?