Hi,ShyerliChan,here is my answer,hope it can help you. 有乜嘢需要帮手嘅话，记得提前话我知喔。pinyin：you有 mie乜 ye嘢 xu需 yao要 bang帮 shou手 ge嘅 hua话, ji记 de得 ti提 qian前 hua话 wo我 zhi知 wo喔.

jia ru ni xu yao wo ge bang zhu,wu gai ti qian tong wo jiang sheng 假如你需要我概帮助，唔该提前同我讲声

ru guo ni xu yao wo de bang zhu. qing ti qian gao su wo. 粤语：如果你需要我帮你手，请提前话我知。

ru guo ni xu yao wo de bang zhu，qing ti qian gao su wo~~~·

If you need my help, please let me know in advance (i.e. before the time they need your help) If you need my help, please let me know (specify a time: e.g. the day before / two days in advance / sooner rather than later, as soon as possible, as soon as you know that you need my help.)