"Will you be back today?" is how you would ask if someone will return today in Engpsh.

This question is formed using the present tense of the verb "be" (will be) and the adverb "today." The word "back" is used to indicate returning to a place.

Here are some example sentences using this phrase:

"I have to go to a meeting this afternoon. Will you be back today?"
"I'm not sure when I'll be finished with my errands. Will you be back today or tomorrow?"
"I'm leaving work early today. Will you be back before I go?"

In Chinese, this question could be translated as: 今天你会回来吗？