喂，你是谁啊?

Wéi, nǐ shì shéi a?

Hey, who are you?

喂，你掉了东西!

Wéi, nǐ diào le dōngxi!

Hey! You dropped something.

喂，你好，我是小明。

Wéi, nǐhǎo, wǒ shì Xiǎomíng.

Hey, hello, I am Xiaoming.