The one that/who/which/whom/whose/when
Relative pronouns in Thai
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Lingo Ninja Research Team
1 min read · published June 22, 2021 · last update July 7, 2021

Relative Pronouns in Thai are easy

Thai has three relative pronouns, but ที่ at (for locations)
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is the one that is used most often:
If the adjective phrase is only a single word, no relative pronoun is used. See the difference in the examples below. For only a single word ("small") the relative pronoun is dropped, but for "very small" it is used.
 
Example without relative pronoun:
The house where they live is small.
บ้าน house, home
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เขา he; she, they
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อยู่ is (located at); live (at); happening now
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เล็ก small
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Example with a relative pronoun
The house where they live is very small. 
บ้าน house, home
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ที่ at (for locations)
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เขา he; she, they
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อยู่ is (located at); live (at); happening now
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เล็ก small
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มาก very, a lot, many
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Examples

He is the one who wears a red shirt
เขา he; she, they
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เป็น be, is, am, are
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คน person, human; person
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ที่ at (for locations)
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กระป๋อง a can, quantifier for cans of soda, tin cans, cans of loose leaf tea or cookies
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เสื้อ shirt
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สีแดง red
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Literally: he - be - person - who - wear - shirt - red

The house where they live is small
บ้าน house, home
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ที่ at (for locations)
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เขา he; she, they
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อยู่ is (located at); live (at); happening now
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เล็ก small
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มาก very, a lot, many
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Literally: house - where - they - live - small - very

The watermelon which he bought is cheap
แตงโม watermelon
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ที่ at (for locations)
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เขา he; she, they
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ซื้อ buy
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ถูก cheap; correct; touch
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มาก very, a lot, many
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Literally: watermelon- which - he - buy - cheap - very

The day when I went there, the weather was hot.
วัน day
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ที่ at (for locations)
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เรา we; I (informal)
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ไป go; too
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ที่นั่น there
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อากาศ weather
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ร้อน hot
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มาก very, a lot, many
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Literally: day - when - I - go - there - weather - hot - very


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