知道, 認識, 懂, 了解: How to Say "Know" in Chinese

English uses one word, “know”, for four different things. Chinese splits them:

• 知道 (zhīdào): know a fact. 我知道他住在台北。 (I know he lives in Taipei.)
• 認識 (rènshi): be acquainted with a person, place or character. 我認識他。 (I know him; we have met.)
• 懂 (dǒng): understand a language or a meaning. 我聽不懂。 (I can’t follow what you said.)
• 了解 (liǎojiě): understand someone or something in depth, or find out about it. 我想多了解台灣。 (I want to learn more about Taiwan.)

If you remember only one pair, remember this one: 知道 is about information, 認識 is about acquaintance. The rest of this guide shows where each verb stops working, with the readings checked against the Ministry of Education dictionary (國語辭典) used in Taiwan.

The four verbs side by side

Verb	Reading	Core idea	Typical object
知道	zhīdào	have the information	a fact, a clause, a name
認識	rènshi	be acquainted	a person, a place, a character
懂	dǒng	grasp the meaning	language, a joke, an explanation
了解	liǎojiě	understand thoroughly	a person, a situation, a culture

A note on reading: the Ministry of Education dictionary gives the everyday “know” as zhīdao, with a light second syllable, and keeps the full-tone zhīdào for the sense of understanding principles. Many Taiwan speakers say the full zhīdào, and both are heard. This page writes zhīdào; a native speaker may prefer zhīdao. 認識 is rènshi with a light second syllable, and 明白 (míngbai, “understand, be clear”) works the same way. Our guide to the neutral tone explains why.

知道: knowing a fact

知道 takes a fact, a question word or a whole clause.

• 我知道。 (I know.)
• 你知道他是誰嗎？ (Do you know who he is?)
• 我不知道車站在哪裡。 (I don’t know where the station is.)
• 你知道現在幾點嗎？ (Do you know what time it is?)

The negative 不知道 (bù zhīdào) is one of the most useful phrases at any level. With a person as object, 知道 means you know of them, not that you have met: 我知道他，但我不認識他 (I know who he is, but I don’t know him).

The dictionary also lists 知曉 (zhīxiǎo) and 曉得 (xiǎode) with the same meaning. 曉得 is rare in Taiwan speech and can read as southern mainland. 知道 is the one to learn first, and it is never wrong.

認識: knowing people, places and characters

認識 is the verb for “to know” a person. It also means “to get to know”, which is why it appears in the first thing you say to a new acquaintance: 很高興認識你。 (Nice to meet you, literally “very happy to know you”.)

• 你認識他嗎？ (Do you know him?)
• 我不認識這個人。 (I don’t know this person.)
• 我在台北不太認識路。 (I don’t really know my way around Taipei.)

認識字: knowing characters

The same verb is used for characters. 認識 a character means you can recognise it and say what it is. The dictionary has a separate entry 認字 (rènzì, “recognise characters”) for this.

• 這個字你認識嗎？ (Do you know this character?)
• 我認識五百個字。 (I recognise five hundred characters.)
• 他認識的字還不多。 (He doesn’t know many characters yet.)

This matters for learners who count their progress in characters: 認識 describes recognition, while 會寫 (huì xiě, “can write”) describes writing from memory. A learner can 認識 a thousand characters and 會寫 far fewer, which is normal and is the reason recognition is usually trained first. If you want the numbers behind this, see how many characters you need to write.

懂: understanding what was said or meant

懂 means you grasp the meaning of something. The most common use is with a perception verb as a result complement: 聽懂 (tīngdǒng, understand by listening) and 看懂 (kàndǒng, understand by reading).

• 我聽不懂。 (I can’t understand, when listening.)
• 你看得懂中文嗎？ (Can you read Chinese?)
• 你懂我的意思嗎？ (Do you understand what I mean?)

懂 is also used about subjects: 他很懂音樂 (he knows a lot about music), 她不懂電腦 (she doesn’t understand computers). Here English says “know”, and Chinese says 懂 because the sense is “has a feel for it”. The dictionary also lists 懂得 (dǒngde), with the same meaning.

The 聽不懂 and 看不懂 forms are potential complements. The grammar behind them is covered in Complements in Chinese.

了解: understanding in depth

了解 goes further than 懂. It means to understand a person or situation properly, or to go and find out about something.

• 我不太了解他。 (I don’t really understand him.)
• 我想了解一下這家公司。 (I’d like to find out about this company.)
• 我了解你的意思。 (I understand what you mean.)

The Ministry of Education dictionary gives two glosses that match these uses: “to understand, to be clear” and “to make clear, to find out”.

了解 or 瞭解?

Both are correct. The dictionary has an entry for each, reads each as liǎojiě, and notes that each is also written the other way. You will see both in Taiwan. Either one can be typed with a Zhuyin or pinyin input method, so choose one and stay consistent in your own writing.

The one trap is the first character. 了 is normally le (the particle), but in 了解 it is liǎo. 瞭 is read liǎo in 瞭解. It has a second reading, liào, only in words for looking into the distance such as 瞭望 (liàowàng), which is why some writers prefer it for 瞭解.

A warning for the phrase “thank you for your understanding”: 謝謝你的了解 is a word-for-word copy of the English. In Taiwan people say 謝謝你的體諒 (tǐliang) or 謝謝你的諒解.

One English “know”, four Chinese choices

When you are unsure, ask what is being known.

You want to say	Use	Example
I know the answer	知道	我知道答案。
I know your sister	認識	我認識你姐姐。
I know that character	認識	我認識這個字。
I know Chinese (can speak it)	會	我會說中文。
I understand Chinese	懂	我懂中文。
I know Taiwan well	了解	我很了解台灣。
I know the way	知道, 認識	我知道怎麼走。 / 我認識路。

For “can speak”, reach for 會, not 知道. The grammar page 會, 能 and 可以 separates skill, ability and permission.

The last row shows that two verbs can both be right. 我知道怎麼走 means you know the directions. 我認識路 means you are familiar with the roads, the way you know a neighbourhood.

Saying “got it” at work

In Taiwan, 了解 is also the standard answer to an instruction, especially at work and in LINE messages: 了解 or 了解了 (understood). Two neighbours do the same job. 收到 (shōudào, “received”) confirms that a message or file has arrived, and 知道了 (zhīdào le) says you have taken note. A colleague who writes 好的，收到 and later 了解 is using the three in their normal places. This is a different use from 我懂了 (I finally get the idea), covered below.

Common mistakes

Using 知道 for people you have met. 我知道他 is true but incomplete. Say 我認識他 when you mean you know him personally.

Using 認識 for facts. ✗ 我認識他住在哪裡 sounds wrong. Facts take 知道.

Using 知道 where you mean “understand”. If a teacher asks 你懂了嗎？ (Do you get it now?) and you reply 我知道, it sounds like “I’m aware of it”. To say you follow, answer 我懂了 (I get it now).

Which to learn first

For daily life in Taiwan, 知道, 不知道, 認識 and 聽不懂 cover most of what a beginner needs, so start there. Add 懂 as a verb of understanding once you have 聽不懂 and 看不懂 firmly, then 了解 when you want to talk about people, cultures and situations. The verbs people say in the same breath, 說 and 講, are compared in 說 vs 講.

Related reading

• 說 vs 講: Saying and Telling in Taiwan Mandarin
• Complements in Chinese
• 會, 能 and 可以
• The neutral tone in Mandarin