Mastering Thai Prepositions: In, On, Under, and More

Directions, descriptions, meeting spots. So much of everyday Thai conversation comes down to explaining where things are. “The market is next to the temple.” “My bag is under the chair.” “The pharmacy is between the school and the hospital.” These are real sentences you will need from your very first week in Thailand.

In English, prepositions are notoriously tricky. You ride “in” a car but “on” a bus. You arrive “at” the airport but “in” Bangkok. Thai does not work that way. Thai prepositions map neatly onto physical space, and once you learn six of them, you can describe the location of almost anything. There is no “in/on/at” overlap to worry about.

One more thing to notice before the examples: Thai location sentences use the verb อยู่ (yùu), which means “to be located at” or “to be in a place.” The structure is always [subject] + อยู่ + [preposition] + [location]. Keep that pattern in mind and the sentences below will click into place immediately.

The อยู่ (yùu) + Preposition Pattern

Before diving into individual prepositions, it helps to understand why อยู่ appears in every example. In Thai, when you want to say something is somewhere, you need a verb of location. อยู่ fills that role. It is not optional. “The book is in the bag” becomes หนังสือ + อยู่ + ใน + กระเป๋า. Strip out อยู่ and the sentence sounds incomplete to a Thai speaker.

With that foundation in place, here are the six prepositions you need to know.

1. ใน (nai): In

ใน covers what is inside a container, a space, or a defined boundary. A bag, a room, a box. If the object is enclosed or contained, ใน is almost certainly your word.

Notice how ใน works the same way with any item inside a bag. You can swap the subject freely: phone, wallet, passport. The structure stays identical.

2. บน (bon): On

บน means on a surface. A table, a shelf, a bed. If something is resting on top of something else, บน is the right call. Unlike English, you do not have to choose between “on” and “on top of” in Thai. บน covers both.

The second example adds นอน (nawn), which means “to sleep” or “to lie down.” Thai often stacks two verbs like this: นอน + อยู่ + บน. Both verbs stay in the sentence, and the meaning sharpens: the cat is not just on the bed, it is lying there sleeping.

3. ใต้ (dtâi): Under

ใต้ describes what is below or beneath something. Shoes under a bed, a cat under a chair, a bag under a table. It is a clean one-to-one match with the English “under.”

ใต้ also appears in geography, where it means “south” as in ภาคใต้ (phâak dtâi), the Southern region of Thailand. Koh Samui sits in ภาคใต้, so you will hear this word in a different context too.

4. ระหว่าง (rá-wàang): Between

ระหว่าง places something in the space separating two other things. It always appears with two reference points joined by กับ (gàb), meaning “and.” The full structure is อยู่ + ระหว่าง + [place A] + กับ + [place B].

ระหว่าง is the longest word in this set, but the logic is consistent. Once you memorize the pattern with กับ, you can plug in any two landmarks and describe what sits between them.

5. หลัง (lǎng): Behind

หลัง means behind or at the back of something. You will hear it constantly when giving directions in Thailand: the restaurant behind the school, the parking lot behind the hotel, the garden behind the house.

หลัง also means “back” in other contexts, like your back as a body part (หลัง) or the rear of a building. The spatial meaning stays the same across uses: it marks what is behind or at the back.

6. ข้างๆ (kâang-kâang): Next to / Beside

ข้างๆ means next to or beside something. The doubled form (with ๆ, which signals repetition) is the most common way to express this. You will also occasionally hear ข้างๆ gàn, meaning “side by side.” For directions and everyday descriptions, ข้างๆ on its own covers most situations.

The second example will come in handy in Thai towns, where coffee shops and banks cluster together. Knowing ข้างๆ makes giving and receiving directions much more natural.

Why Thai Prepositions Are Easier Than English Ones

English learners struggle with prepositions for years. Do you arrive “at” the station or “in” the station? Are you “on” a team or “in” a team? The rules are inconsistent and often require memorization by context.

Thai prepositions are more systematic. ใน means physically inside. บน means physically on a surface. ใต้ means physically below. The spatial logic holds across nearly all uses. You will not spend weeks wondering whether to use ใน or บน the same way English learners agonize over “in” versus “on.”

The one thing that does require adjustment is remembering that อยู่ must appear in every location sentence. Once that habit is set, the rest falls into place quickly.

Practice: Fill in the Blank

Choose the correct preposition for each sentence. The answers follow the exercise.

1. โทรศัพท์ของฉันอยู่ ___ กระเป๋า (thoo-rá-sàp khǎawng chán yùu ___ grà-bpǎo): My phone is in the bag.
2. หนังสือของเขาอยู่ ___ โต๊ะ (nǎng-sǔe khǎawng kháo yùu ___ dtó): His book is on the table.
3. แมวซ่อนอยู่ ___ โซฟา (maew sâawn yùu ___ soo-faa): The cat is hiding under the sofa.
4. โรงพยาบาลอยู่ ___ โรงเรียนกับห้างสรรพสินค้า (roong-phá-yaa-baan yùu ___ roong-rian gàb hâang-sàp-phá-sǐn-kháa): The hospital is between the school and the shopping mall.
5. เด็กๆ เล่นอยู่ ___ บ้าน (dèk-dèk lên yùu ___ bâan): The children are playing behind the house.
6. ร้านกาแฟอยู่ ___ ธนาคาร (ráan gaa-fae yùu ___ thá-naa-khaan): The coffee shop is next to the bank.

Answers

Quick Reference: 6 Prepositions for Location

These six words will take you far in daily Thai conversations. If you want to build on them with real speaking practice, take a look at private Thai lessons with Nariss, where you can practise location vocabulary in real dialogue from the first session. You might also find it useful to explore how to say “almost” in Thai, another grammar point that comes up constantly in natural conversation.