J'ai un livre.
English: I have a book.
The verb 'avoir' means 'to have' in French. It is an important irregular verb that you will use often.
Use 'avoir' in French to talk about possession (things you have), age, certain feelings, and in some common expressions.
J'ai un livre.
English: I have a book.
Tu as une sœur.
English: You have a sister.
Nous avons faim.
English: We are hungry.
Elle a dix ans.
English: She is ten years old.