Learn Hardcore Vietnamese: Lan thích đọc sách trong thư viện.

In Vietnamese, personal names typically stand on their own without articles like "the" in English. There is no direct equivalent of "the" or "a" before a person's name.

Why is thích used here for "like"?

Thích directly translates to "like" or "enjoy." In this context, it's the simplest and most common way to express preference or enjoyment of an activity.

Why do we use trong thư viện and not just thư viện?

Trong means "inside" or "in," so trong thư viện emphasizes the location of the action (reading) as being inside the library. If you just say ở thư viện, that still means "at the library," but trong makes it explicit that Lan is reading inside (rather than just at or near the library).

When do we add the classifier cuốn (or quyển) for books in Vietnamese?

Classifiers like cuốn or quyển are generally used when referring to a specific book or a quantity of books. For example, một cuốn sách ("one book"). In this sentence, đọc sách is a general statement about reading books, so no classifier is needed.