Final answer:
Est-ce que is a particle in French used for questions, commonly added at the beginning of sentences. It can be considered somewhat outdated by current French speakers.
Explanation:
Est-ce que is a particle used in French to form yes-no questions by adding it to the beginning of a sentence. It is considered somewhat old-fashioned among contemporary speakers who often use question intonation instead. An example is "Est-ce que tu te souviens de notre excursion en montagne?" where the response is "Oui, je m'en souviens!"
Learn more about French language yes-no questions here:
https://brainly.com/question/28442842
