原書拼音: mou5 ni1 zi1 go1 zai2 coeng3:mou5 nei1 zi1 go1 zai2 coeng3
比喻過去某件事（通常係指好嘅事）唔會再有；好景不再 (something (usually something good) no longer true due to change of circumstances; literally, a song sung no more)
語句用例
而家經濟咁差，冇升職加薪呢支歌仔唱㗎喇。
ji4 gaa1 ging1 zai3 gam3 caa1, mou5 sing1 zik1 gaa1 san1 ni1 zi1 go1 zai2 coeng3 gaa3 laa3.
Nowadays the economic situation is so poor. Benefits like promotion or getting a rise are no longer viable.
比喻過去可行嘅方法而家行唔通 (used to describe that a method used in the past no longer works due to change of circumstances)
用例
唔好再信勤力讀書就考到5**，冇呢支歌仔唱㗎喇。
m4 hou2 zoi3 seon3 kan4 lik6 duk6 syu1 zau6 haau2 dou2 ng5 sing1 sing1, mou5 ni1 zi1 go1 zai2 coeng3 gaa3 laa3.
Stop believing that paying efforts will lead to getting Level 5**. This strategy will not work anymore.