How do you say hi in all the languages?

It's impossible to list "hi" in every language, as there are thousands of languages spoken around the world! However, I can provide you with a list of greetings in some of the most common languages.

Common Greetings:

* English: Hi, Hello

* Spanish: Hola

* French: Bonjour (formal), Salut (informal)

* German: Hallo

* Italian: Ciao (informal), Buongiorno (formal)

* Portuguese: Olá

* Russian: Привет (Privet)

* Chinese (Mandarin): 你好 (nǐ hǎo)

* Japanese: こんにちは (konnichiwa)

* Korean: 안녕하세요 (annyeonghaseyo)

* Arabic: مرحبا (marhabaan)

* Hindi: नमस्ते (namaste)

* Vietnamese: Xin chào

* Turkish: Merhaba

* Greek: Γεια σου (Ya sou)

Remember:

* Formal greetings are used in more formal situations, like when speaking to someone you don't know well or someone older than you.

* Informal greetings are used with friends and family.

Tip: For more specific greetings, you can search online for "how to say hi in [language name]". You can also use language learning apps or websites to learn common phrases in different languages.