They are verb conjugations for the word eat. For example:

Je mange

Tu manges

Vous mangez

I highly recommend using listeningpractice.org for practicing verb conjugation. You can choose what tenses to practice and what verbs to practice. Start simply and work your way up. If you need help you can click on a link and it will take you to a page where you can get the full conjugation as well as sample sentences.

Please, read the grammar "Tips and notes" in the web version of Duolingo (www.duolingo.com)

You can read them on Pc or on your phone or tablet , when you set your browser in "Desktop mode"

The conjugations of "manger" are explained in the Lesson page of the skills:

• Basics 1
  Subject-Verb Agreement
  Notice above that the verb manger (as well as its English equivalent, "to eat") changes form to agree grammatically with the subject. These forms are called conjugations of that verb.

• Verbs: Present 1
  Conjugations and Infinitives

.... and here are the links to other useful grammar explainations in Duolingo:

• Overview of French grammar and vocabulary explanations
  https://www.duolingo.com/comment/4013405
• Grammar Glossary, Helpful Links, and Tips amp; Notes!
  https://www.duolingo.com/comment/4614759

https://www.youtube.com/watch?v=PXRrQCqerv8

Bon courage Sara :)

yes , it id: je mange tu manges il mange nous mangEons vous mangez ils mangent