It's important to note that "tais-toi" is considered a very direct and sometimes rude way of telling someone to be quiet, particularly in formal settings. In informal situations, it can be used playfully or jokingly.
Here are some other ways to say "be quiet" in French, depending on the context:
* "Chut!" (shh) - This is a very informal way of telling someone to be quiet, often used with children.
* "Silence!" - This is a more formal way of demanding silence, used in situations like a library or classroom.
* "Fais silence, s'il te plaît." (Be quiet, please) - This is a more polite and respectful way of asking someone to be quiet.
* "Sois tranquille." (Be calm/quiet) - This is a less direct way of asking someone to be quiet, often used in situations where someone is being disruptive but not necessarily speaking loudly.