How do you say when come back in Chinese?

There are a few ways to say "when come back" in Chinese, depending on the context and level of formality:

Formal:

* 什么时候回来 (shénme shíhou huílai): Literally "what time come back", this is the most common and neutral way to ask.

* 您什么时候回来 (nín shénme shíhou huílai): This is a more polite version, using "您" (nín) for respectful address.

Informal:

* 你什么时候回来 (nǐ shénme shíhou huílai): This is a less formal version, using "你" (nǐ) for informal address.

* 你啥时候回来 (nǐ shǎshíhou huílai): This is a very casual and colloquial way to say it, using "啥" (shǎ) for "what."

* 啥时候回来 (shǎshíhou huílai): This is even more casual, omitting the subject pronoun.

To specify the time:

You can add a specific time after any of these phrases. For example:

* 你明天什么时候回来？ (nǐ míngtiān shénme shíhou huílai?): When will you come back tomorrow?

* 你晚上什么时候回来？ (nǐ wǎnshang shénme shíhou huílai?): When will you come back tonight?

Remember to choose the appropriate level of formality depending on the context and your relationship with the person you're speaking to.