The core principle

Mandarin adjectives behave like verbs. They can be the predicate of a sentence by themselves, with no copula.

• 我冷。 (Wǒ lěng.) - I am cold.
• 这个好。 (Zhè ge hǎo.) - This one is good.
• 他高。 (Tā gāo.) - He is tall.
• 中文难。 (Zhōng wén nán.) - Chinese is hard.

There is NO 是 in any of these. Inserting one (我是冷) is ungrammatical. The English-speaking instinct to bridge 'I' and 'cold' with 'am' has to go.

The technical term for these words is stative verbs. They describe a state. They conjugate like verbs (which is to say, they don't, because Mandarin verbs don't conjugate), they negate like verbs, and they question like verbs.

The 很 filler

Bare-adjective sentences like 我冷 or 他高 sound oddly emphatic to a native ear - as if you're comparing or complaining. The neutral form prepends 很 (hěn), which usually means 'very' but in this construction is essentially empty.

• 我很冷。 (Wǒ hěn lěng.) - I'm cold. (Neutral, the standard way to say it.)
• 这个很好。 (Zhè ge hěn hǎo.) - This one is good.
• 他很高。 (Tā hěn gāo.) - He is tall.
• 中文很难。 (Zhōng wén hěn nán.) - Chinese is hard.

In these sentences, 很 does NOT mean 'very'. It's a tonal smoothing particle that turns a bare stative verb into a balanced statement. If you genuinely mean 'very', you reach for stronger intensifiers: 非常 (fēi cháng, really), 真 (zhēn, truly), or the 太…了 frame.

The Taipei classroom moment that fixed this for me was the teacher writing 我累 (I am tired) and 我很累 (I am tired) on the board and asking which one you'd say after work. Answer: 我很累, every time. 我累 sounds like the opening of a complaint or a comparison. The neutral statement keeps 很 in front.

Real intensifiers

When you actually do want to amp up the adjective, use these instead of 很:

Use these when intensity is the actual content of your sentence. Reserve 很 for the neutral-filler job.

Negation: 不, not 没

Stative verbs negate with 不, never 没.

• 我不冷。 (Wǒ bù lěng.) - I'm not cold.
• 这个不好。 (Zhè ge bù hǎo.) - This one isn't good.
• 中文不难。 (Zhōng wén bù nán.) - Chinese isn't hard.

When 不 is the negator, 很 drops out - you don't say 我不很冷 for 'I'm not cold' (that would mean 'I'm not very cold' specifically).

The 没 negator only enters when you're talking about a CHANGE that hasn't happened yet, paired with 了:

• 我没冷。 (Wǒ méi lěng.) - I haven't got cold (yet), suggesting an expected change of state.

For the basic 'I am not cold', stick with 我不冷.

Modifying nouns: 的 sometimes, not always

When an adjective modifies a noun (not as the predicate, but attributively, like English 'red car'), it usually attaches via 的.

• 红色的车 (hóng sè de chē) - red car
• 很贵的手机 (hěn guì de shǒu jī) - a very expensive phone
• 难学的语言 (nán xué de yǔ yán) - a hard-to-learn language
• 好看的书 (hǎo kàn de shū) - a nice-looking book

But one-syllable common adjectives often attach directly, without 的:

• 大房子 (dà fáng zi) - big house
• 新车 (xīn chē) - new car
• 好人 (hǎo rén) - good person
• 小猫 (xiǎo māo) - little cat

The rule of thumb: monosyllabic + common = no 的; two-syllable or modified = 的. 大书 (big book) works; 很大的书 (a very big book) needs the 的 because there's a modifier in front of 大.

Adjective + 了: 'has become', 'too X now'

Adding 了 (le) at the end of a sentence containing an adjective signals a NEW state or that a limit has been passed.

• 太贵了。 (Tài guì le.) - It's too expensive (now / for me).
• 他大了。 (Tā dà le.) - He's grown up / He's bigger now.
• 天黑了。 (Tiān hēi le.) - It's got dark.
• 我累了。 (Wǒ lèi le.) - I've become tired.

This is the change-of-state 了, the same particle that runs Mandarin's aspect system. See the aspect-markers page for the full picture.

Stative verbs as adverbs

Some adjectives double as adverbs in compounds with another verb. The pattern is adjective + verb = a descriptive adjective for the verb's noun.

• 好吃 (hǎo chī) - good-eat = tasty (for food)
• 好看 (hǎo kàn) - good-look = nice-looking (for clothes, scenery, films)
• 好听 (hǎo tīng) - good-listen = pleasant-sounding (for music, voices)
• 难学 (nán xué) - hard-learn = hard to learn (for languages, skills)
• 难看 (nán kàn) - hard-look = ugly

These compounds are themselves stative verbs, and they follow the same rules: 这本书很好看 (this book is good-looking, i.e. nice to read), 法语很难学 (French is hard to learn). The whole compound is one adjective.

What to internalise

1. No 是 before an adjective. 我冷, not 我是冷.
2. 很 is a neutral filler, not 'very'. Use 非常 / 太…了 / 真 when you want actual intensity.
3. Negate with 不. 不冷, 不好, 不难. 没 is for the change-hasn't-happened reading.
4. 的 attaches longer or modified adjectives to nouns. Single-syllable common ones go without.
5. Adjective + 了 = change of state. 太贵了, 他大了.

For the rest of the grammar inventory, see the Mandarin grammar cheatsheet.