Learn to regret an action that was taken.
The rule
なければよかった is used to regret an action that was taken. Structure: Vない→なければよかった. The negative marks the action one would have preferred to avoid.
Examples
あんなことを言わなければよかったです。
I should not have said such a thing.
高い服を買わなければよかったです。
I should not have bought those expensive clothes.
Remember
- Structure: Vない→なければよかった
- The negative marks the action one would have preferred to avoid.