"I am eating my sandwich."

Translation: Je mange mon sandwich.

[deactivated user]

Can someone explain what is the difference between "mon" and "ma", I wrote Je mange ma sandwich, and it was wrong.

[CommeuneTexane]

"Mon" and "ma" both meant "my," but mon is used for masculine nouns: mon sandwich, mon stylo, mon sac, etc. Ma is used with feminine nouns like: ma lettre, ma maison, ma voiture. Unlike English, the agreement comes with the noun not the person possessing it. Therefore it is always masculine even if a woman owns the sandwich. Her sandwich = son sandwich.

Check out the tips and notes here: https://www.duolingo.com/skill/fr/Possessives/tips-and-notes

[AmineHadji1]

un sandwich is masculine in French. mon/ma/mes are called possessive adjectives, and adjectives have to agree in gender and number in French. Since sandwich is masculine singular, you have to use mon (also masculine singular)

[Nathan979847]

Can someone please explain when we will use "mes". I understand "ma" is for féminin nouns and mon for masculin nouns. But "mes"??

[CommeuneTexane]

Certainly! "Mes" is for plural nouns whether they are feminine or masculine.

my sandwiches = mes sandwichs
my chickens = mes poules
my books = mes livres

Other plural possessive adjectives: tes, ses, nos, vos, leurs