It depends. It may be: "They are reading their book", or "They are reading your book". "They" refering to females.
Voy a usar un libro texto para estudiar español. I am going to use a textbook to study Spanish.
"Reading a book" is "leyendo un libro." Usually this would be combined with a conjugated form of "estar", such as "Estoy leyendo un libro", or "I am reading a book."
Libro que estas leyendo ahora no me interesa
"reading" in Spanish is "leyendo". It is usually combined with a conjugated form of the verb "estar". "Estoy leyendo el libro" would be "I am reading the book". This form (present progressive) is not used all that often in Spanish, at least compared with English. More often you would see "Leo el libro", which would commonly be translated as "I am reading the book."
Two people reading a book = Dos personas leyendo un libro.
It means "a book but (subject) is not reading it". If this was a full sentence like "Él tiene un libro pero no lo está leyendo.", then it would mean "He has a book but he isn't reading it".
to read= leer.To read: (Verb) Leer.For example:-Read this book = Lee este libro.-I like to read = Me gusta leer.-What are you reading? = Que estas leyendo?
If you meant "I am reading my book." then it would be "Yo estoy leyendo mi libro."
"Read" "Leer" "Reading" "Leyendo" "I am going to read a book" "Voy a Leer un libro"
el libro
The kind of book you read is called "libro".El libro = The bookUn libro= A book"El libro" is 'The book.'Libro(English) Like 'look', but beginning 'b'.(Spanish) 'libro', AFI: ['li.βɾo]
Libro means book in Spanish.