According to Dr. Cumberland, a dying language needs a dictionary and people to understand and record its grammar. Most importantly, listen to those who still speak the you need to language. This can be very difficult,especially if there are very few speakers of the language left. For example, when researchers were working to save the it was language Ayapaneco in Mexico hard for them to record anything because the last two people on Earth who could speak the language refused to speak to each other!