Sách ở trên kệ.

The book is on the shelf.

Breakdown of Sách ở trên kệ.

• ở: at
• sách: the book
• trên: on (on top of)
• kệ: the shelf

Questions & Answers about Sách ở trên kệ.

Why does sách come first in Sách ở trên kệ?

Vietnamese often states the thing being talked about first, followed by its location or description.

So:

• sách = book / books
• ở trên kệ = on the shelf

Literally, the sentence is something like Book(s) [are] on shelf.

This is a very common Vietnamese pattern:

• X ở Y = X is at/in/on Y

So Sách ở trên kệ follows a normal Vietnamese word order.

Is there a missing verb here? Where is is/are?

There is no missing word. In Vietnamese, you usually do not need a verb like is/are in the same way English does.

In this sentence:

• ở functions as to be at / located at / in / on, depending on context

So Sách ở trên kệ naturally means The book is on the shelf or Books are on the shelf without adding a separate word for is/are.

What exactly does ở mean here?

Here, ở marks location. It often means:

• at
• in
• on
• located at

In Sách ở trên kệ:

• ở tells you where the book is
• trên kệ gives the location

So you can think of ở as the core location word in the sentence.