You just learned that an adjective normally links to its noun with 的. Now the important exception: a bare, one-syllable adjective very often drops the 的 and fuses directly onto the noun. 好人 (hǎorén) is "a good person," 新车 (xīn chē) is "a new car," 热水 (rè shuǐ) is "hot water" — no 的 in sight. The two short syllables lock together into a tight, rhythmic unit, and many such pairs have hardened into fixed compounds you'll find as single dictionary entries. The rule of thumb is beautifully simple: bare monosyllable → drop 的; anything longer or modified → keep 的.
The tight monosyllable + noun unit
A single-syllable adjective placed straight before a noun forms a compact, often lexicalized compound. Adding 的 here would sound heavy, or nudge the meaning toward "the one that is…" rather than the plain category:
| Adjective + noun (no 的) | Pinyin | Meaning |
|---|---|---|
| 好人 | hǎorén | a good person |
| 新车 | xīn chē | a new car |
| 热水 | rè shuǐ | hot water |
| 大城市 | dà chéngshì | a big city |
| 大房子 | dà fángzi | a big house |
| 旧书 | jiù shū | an old book |
| 小猫 | xiǎo māo | a kitten / little cat |
别担心，他是个好人。
bié dānxīn, tā shì ge hǎorén
Don't worry — he's a good person.
我爸上个月买了一辆新车。
wǒ bà shàng ge yuè mǎile yí liàng xīn chē
My dad bought a new car last month.
服务员，请给我一杯热水。
fúwùyuán, qǐng gěi wǒ yì bēi rè shuǐ
Waiter, please bring me a cup of hot water.
北京是个大城市，生活节奏很快。
Běijīng shì ge dà chéngshì, shēnghuó jiézòu hěn kuài
Beijing is a big city — the pace of life is fast.
Add anything, and 的 comes back
The drop is licensed only for the bare monosyllable. The moment the adjective is modified — by 很, 太, a two-syllable form, or any phrase — you must restore 的:
| Bare (no 的) | Modified (的 returns) |
|---|---|
| 好人 (hǎorén) | 很好的人 (hěn hǎo de rén) |
| 新车 (xīn chē) | 很新的车 (hěn xīn de chē) |
| 热水 (rè shuǐ) | 很热的水 (hěn rè de shuǐ) |
| 大城市 (dà chéngshì) | 很大的城市 (hěn dà de chéngshì) |
他是一个很好的人，大家都喜欢他。
tā shì yí ge hěn hǎo de rén, dàjiā dōu xǐhuan tā
He's a really good person — everyone likes him. (很好 → 的 returns)
水太热了，我要一杯温的。
shuǐ tài rè le, wǒ yào yì bēi wēn de
The water's too hot — I want a warm one.
好人 vs 好的人 — the same words, a different reading
Dropping 的 isn't only about sounding lighter; keeping it can genuinely shift the meaning. 好人 names a kind of person — "a good person" as a category. 好的人, by contrast, leans toward picking one out from a set: "the ones who are good," "whichever people are good." The bare compound classifies; the 的 version selects.
这世界上好人还是多的。
zhè shìjiè shàng hǎorén háishì duō de
There are still plenty of good people in this world. (好人 as a category)
好的人留下，不合适的我们再找。
hǎo de rén liúxià, bù héshì de wǒmen zài zhǎo
Keep the good ones; we'll keep looking for the ones who don't fit. (好的 selects a subset)
This selecting sense is exactly the adjective + 的 as a noun pattern (红的 "the red one"), and all of it is the one structural 的 doing its modifying job. Be aware, too, that some monosyllable + noun strings are fully frozen words — 大人 (dàrén, "adult"), 白菜 (báicài, "Chinese cabbage") — where inserting 的 would simply be wrong, because they are no longer felt as "adjective + noun" at all.
Common Mistakes
1. Inserting 的 into a fixed monosyllable compound. For the plain category "a good person," it's 好人, not 好的人.
❌ 他是一个好的人。
Odd for the plain sense — say 他是个好人; 好的人 shifts to 'the ones who are good'.
✅ 他是个好人。
tā shì ge hǎorén
He's a good person.
2. Dropping 的 after a modified adjective. 很大 is modified, so the generic-compound drop no longer applies.
❌ 上海是一个很大城市。
Incorrect — 很大 needs 的: 很大的城市.
✅ 上海是一个很大的城市。
Shànghǎi shì yí ge hěn dà de chéngshì
Shanghai is a very big city.
3. Adding 的 to a two-syllable adjective as if it could drop. Only bare monosyllables drop 的; two-syllable adjectives keep it.
❌ 我要一杯干净水。
Incorrect — the two-syllable 干净 needs 的: 干净的水.
✅ 我要一杯干净的水。
wǒ yào yì bēi gānjìng de shuǐ
I want a cup of clean water.
4. Using 二 instead of 两 before a measure word. For "two" in front of a measure word it's always 两.
❌ 二辆新车
Incorrect — before a measure word 'two' is 两, not 二.
✅ 两辆新车
liǎng liàng xīn chē
two new cars.
Key Takeaways
- A bare one-syllable adjective usually drops 的 and fuses with the noun: 好人, 新车, 热水, 大城市.
- The driver is rhythm — adjective + noun already makes a clean two-beat unit.
- Modify the adjective (很, 太, a second syllable, a phrase) and 的 returns: 很好的人, 干净的水.
- Keeping 的 can shift the reading from category (好人) to selecting a subset (好的人).
- Some monosyllable compounds are frozen words (大人, 白菜) where 的 is simply not an option.
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Start learning Chinese→Related Topics
- Attributive Adjectives with 的HSK 1 — To put an adjective in front of a noun, Chinese links the two with 的: 漂亮的花 'a pretty flower', 红色的车 'a red car', 很好的朋友 'a good friend'. 的 is the adjective-to-noun glue, and a modified adjective almost always requires it.
- When to Drop 的HSK 2 — 的 is often omitted in tight, high-frequency pairings — close kin and in-groups (我妈, 我们学校, 你家) and bare monosyllable-adjective + noun set phrases (好人, 大城市). Intimacy and lexicalisation license the drop.
- Adjective + 的 as a Noun (红的)HSK 2 — Drop the head noun after an adjective + 的 and the phrase itself becomes a noun — 'the ___ one': 红的 'the red one', 大的 'the big one', 我要便宜的 'I want the cheap one'. 的 does the work English needs 'one/ones' for.
- Stacking Multiple ModifiersHSK 4 — When several modifiers pile up before a noun, Chinese fixes their order: possessive/demonstrative + number-measure + descriptive adjective + noun. 我的那三本有意思的书 'those three interesting books of mine'.