Shì / qíng / yǐ / jīng / fā / shēng / le / xiàn / zài / hòu / huǐ / yě / zhǐ / shì / fù / shuǐ / nán / shōu

事情已经发生了，现在后悔也只是覆水难收。

It has already happened, and regretting it now will not change anything.