Here are some examples of how "je dit" can be used in a sentence:
* Je dit que tu as tort. (I say that you are wrong.)
* Je dit la vérité. (I'm telling the truth.)
* Je dit bonjour. (I say hello.)
It's important to note that "je dit" is usually followed by a clause, like "que tu as tort" or "la vérité". It can also be used by itself, but it's less common.