must center
Regular verb: center - centered- centered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must center
you must center
he must center
we must center
you must center
they must center 	I must be centering
you must be centering
he must be centering
we must be centering
you must be centering
they must be centering	I must have centered
you must have centered
he must have centered
we must have centered
you must have centered
they must have centered	I must have been centering
you must have been centering
he must have been centering
we must have been centering
you must have been centering
they must have been centering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't center
you mustn't center
he mustn't center
we mustn't center
you mustn't center
they mustn't center 	I mustn't be centering
you mustn't be centering
he mustn't be centering
we mustn't be centering
you mustn't be centering
they mustn't be centering	I mustn't have centered
you mustn't have centered
he mustn't have centered
we mustn't have centered
you mustn't have centered
they mustn't have centered	I mustn't have been centering
you mustn't have been centering
he mustn't have been centering
we mustn't have been centering
you mustn't have been centering
they mustn't have been centering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I center?
must you center?
must he center?
must we center?
must you center?
must they center? 	must I be centering?
must you be centering?
must he be centering?
must we be centering?
must you be centering?
must they be centering? 	must I have centered?
must you have centered?
must he have centered?
must we have centered?
must you have centered?
must they have centered? 	must I have been centering?
must you have been centering?
must he have been centering?
must we have been centering?
must you have been centering?
must they have been centering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I center?
mustn't you center?
mustn't he center?
mustn't we center?
mustn't you center?
mustn't they center? 	mustn't I be centering?
mustn't you be centering?
mustn't he be centering?
mustn't we be centering?
mustn't you be centering?
mustn't they be centering? 	mustn't I have centered?
mustn't you have centered?
mustn't he have centered?
mustn't we have centered?
mustn't you have centered?
mustn't they have centered? 	mustn't I have been centering?
mustn't you have been centering?
mustn't he have been centering?
mustn't we have been centering?
mustn't you have been centering?
mustn't they have been centering?