How do you say hello class in Chinese?

There are a few ways to say "hello class" in Chinese, depending on the context and formality:

Formal:

* 同学们好！ (Tóngxuéshēng hǎo!) - This is the most common and formal way to greet the class. It literally means "Students, good!"

* 大家好！ (Dàjiā hǎo!) - This means "Hello everyone!" and can be used in a slightly less formal setting.

Informal:

* 嗨，同学们！ (Hài, tóngxuéshēng!) - This is a more casual way to greet the class, similar to "Hey guys!"

For a specific class:

* X班的同学们，大家好！ (X bān de tóngxuéshēng, dàjiā hǎo!) - This means "Hello everyone in class X!" Replace X with the actual class number.

Note: The tone and inflection of your voice can also convey formality or informality.