English verb conjugation
MUST CENTER

Regular verb: center - centered - centered

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I must not center you must not center he must not center we must not center you must not center they must not center	I must not be centering you must not be centering he must not be centering we must not be centering you must not be centering they must not be centering
Perfect	V-ing perfect
I must not have centered you must not have centered he must not have centered we must not have centered you must not have centered they must not have centered	I must not have been centering you must not have been centering he must not have been centering we must not have been centering you must not have been centering they must not have been centering

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
must I not center? must you not center? must he not center? must we not center? must you not center? must they not center?	must I not be centering? must you not be centering? must he not be centering? must we not be centering? must you not be centering? must they not be centering?
Perfect	V-ing perfect
must I not have centered? must you not have centered? must he not have centered? must we not have centered? must you not have centered? must they not have centered?	must I not have been centering? must you not have been centering? must he not have been centering? must we not have been centering? must you not have been centering? must they not have been centering?