What does comment tu mean?

"Comment tu" is the beginning of the French phrase "Comment tu vas". It means "How are you?"

Here is a breakdown of the phrase:

* Comment: How

* tu: you (informal, singular)

* vas: go (in this context, it means "are")

So, "Comment tu vas" literally translates to "How you go", but it's understood to mean "How are you?".

It's a common and polite way to greet someone in French, especially in informal settings.