Chinese phrase
来之前请告诉我一声 lái zhī qián qǐng gào sù wǒ yì shēng
Meaning
Please let me know before you come
When to use it
It politely asks for notice before someone comes. It is common when advance notice helps with planning or preparation, and the tone is friendly and conversational.
Example dialogue
你下周来我家，来之前请告诉我一声，我好准备饭菜。 nǐ xià zhōu lái wǒ jiā lái zhī qián qǐng gào sù wǒ yì shēng wǒ hǎo zhǔn bèi fàn cài
If you are coming to my place next week, please let me know before you come so I can prepare the food.
好，我会提前告诉你。 hǎo wǒ huì tí qián gào sù nǐ
Okay, I will let you know ahead of time.