FrenchTutoyer / VouvoyerTo use tu / vous when addressing someone.

The concept of using "tu" vs. "vous" is extremely important in French; for example, one would use "tu" with friends, family, peers, and in very informal settings, while "vous" is more formal and used to address higher-ups, older people, or multiple people at the same time. Therefore, it's useful for them to have a verb that describes which word they use to address someone, especially if one is unsure which word to use. English, on the other hand, just has the word "you". As a result, not only do we not have a verb like "tutoyer," the very concept that the verb is based on just doesn't exist in our language at all.