再也不 / 再也没【zài yě bù / zài yě méi】

再也 before a negative means "never again". 再也不 looks forward: from now on, it won't happen. It usually ends in 了, since a change has just been decided.

再也没 looking back

再也没 tells a story: after some point in the past, the thing never happened again. A time clause often sets that point, and 过 can follow the verb.

The choice follows the usual line between 不 and 没: 不 for what you will or won't do, 没 for what did or didn't happen.

• × 那次以后，他再也不来过 → 那次以后，他再也没来过

Word order

再也 stays together, right before 不 or 没.

• × 我再不也去了 → 我再也不去了
• × 我也再不去了 → 我再也不去了

不再 also exists and means "no longer". It is flatter and more written; 再也不 carries feeling, often a promise or a complaint.