Translation:You write a book.
is "kamu" singular or plural you, or does Indonesian not distinguish?
edit: I found the tips and notes page. It's singular, and informal
You are right
Plural you is kalian, kamu is always singular.
How do I differentiate "a book" and "the book"?
Oh, kamu menulis buku itu!
Wouldn't that be "You write that book"