收到，接到佢之後話聲我知。
sau1 dou2 zip3 dou2 keoi5 zi1 hau6 waa6 seng1 ngo5 zi1
Got it. Let me know once you've picked them up.
Let me knowin Cantonese.
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Canto SchoolPronunciation
話聲我知
waa6 seng1 ngo5 zi1
let me know
Recorded Cantonese
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When to use it
Use 話聲我知 in a practical request; add 唔該 when asking another person to help you.
Examples
有消息就話聲我知
jau5 siu1 sik1 zau6 waa6 seng1 ngo5 zi1
Let me know when there is news.