must better
Regular verb: better - bettered- bettered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must better
you must better
he must better
we must better
you must better
they must better 	I must be bettering
you must be bettering
he must be bettering
we must be bettering
you must be bettering
they must be bettering	I must have bettered
you must have bettered
he must have bettered
we must have bettered
you must have bettered
they must have bettered	I must have been bettering
you must have been bettering
he must have been bettering
we must have been bettering
you must have been bettering
they must have been bettering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't better
you mustn't better
he mustn't better
we mustn't better
you mustn't better
they mustn't better 	I mustn't be bettering
you mustn't be bettering
he mustn't be bettering
we mustn't be bettering
you mustn't be bettering
they mustn't be bettering	I mustn't have bettered
you mustn't have bettered
he mustn't have bettered
we mustn't have bettered
you mustn't have bettered
they mustn't have bettered	I mustn't have been bettering
you mustn't have been bettering
he mustn't have been bettering
we mustn't have been bettering
you mustn't have been bettering
they mustn't have been bettering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I better?
must you better?
must he better?
must we better?
must you better?
must they better? 	must I be bettering?
must you be bettering?
must he be bettering?
must we be bettering?
must you be bettering?
must they be bettering? 	must I have bettered?
must you have bettered?
must he have bettered?
must we have bettered?
must you have bettered?
must they have bettered? 	must I have been bettering?
must you have been bettering?
must he have been bettering?
must we have been bettering?
must you have been bettering?
must they have been bettering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I better?
mustn't you better?
mustn't he better?
mustn't we better?
mustn't you better?
mustn't they better? 	mustn't I be bettering?
mustn't you be bettering?
mustn't he be bettering?
mustn't we be bettering?
mustn't you be bettering?
mustn't they be bettering? 	mustn't I have bettered?
mustn't you have bettered?
mustn't he have bettered?
mustn't we have bettered?
mustn't you have bettered?
mustn't they have bettered? 	mustn't I have been bettering?
mustn't you have been bettering?
mustn't he have been bettering?
mustn't we have been bettering?
mustn't you have been bettering?
mustn't they have been bettering?