You need to be responsible/obligated/obliged to your behavio(u)r. (behaviour是英式拼写,behavior是美式拼写)
You ought to take responsibility/obligation for your own action.
You are supposed to be of obligation to what you have done.
之中need to/ought to/be supposed to/should均可相互替换。
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You should be responsible for what you have done.
You should take full responsibility of what you have done.
You should be held accountable for what you have done.
Be responsible for
You shall be held accountable for your conduct.
You should answer for your conduct.
You should be responsible for your behavior.