信xìnxìnletter (mail)Usages of xìn我wǒ 收到shōudào 信xìn 了le。wǒ shōudào xìn le.I received the letter.信xìn 是shì 朋友péngyou 写xiě 的de。xìn shì péngyou xiě de.The letter was written by a friend.Elon.io is an online learning platformWe have an entire course teaching Chinese grammar and vocabulary.Start learning Chinese now