My teacher said that a particle word in Chinese is a function word, but don't quite understand what is means. How does the particle word such as "呢" work?
Also, are there any other Chinese particle words out there? Thanks in advance!
As others have pointed out, 呢 is a sentence-final particle that nowadays mostly has an interrogative function, namely to form a question regarding a topic that has already been brought up.
The normal interrogative particle is 吗, as in 你是中国人吗？ Or more rhetorically using 吧: 你是中国人吧？ But if you first introduce your own nationality, the question would instead involve the particle 呢: 我是丹麦人，你呢？
If you read older literature like 红楼梦, you will also find 呢 as a sentence-final particle that is not interrogative, but rather emphatic. It may indicate softening or suggestion, like in the sentences 尤氏的母亲已先在这里呢 and 太太们都在楼上坐着呢，请奶奶就从这边上去罢。
Other such particles are 吧 (softening of statements) and 啊 (affirmation).
Then there is a whole range of exclamative particles and interjections used in spoken Chinese, such as 呗 (when stating something obvious or with authority), 嗯 (acknowlegding), 哦 (surprise), and 哇 (awe).
Functional particles that are essential to Chinese grammar include 着 (durative aspect particle for continuous action, 我穿着衣服 = I am getting dressed), 了 (completion, 我回来了 = I am back, or 我不抽烟了 = I am not smoking anymore), and 的 (possessive particle: 我的车子).
Particles are thus used to modify words and sentences. They are not words per se, but add structure to sentences.
There are many sentence-ending particles in Chinese. Among them 呢 and 吗 are the most commonly used ones.
The particles 呢 (ne) and 吗 (ma) are very commonly used in both written and spoken Chinese. Check out the similarities and differences between the particle words呢 (ne) and 吗 (ma).
吗 is used to turn statements into yes-no questions.
zhè shì tú shū ɡuǎn 这是图书馆。 This is a library. zhè shì tú shū ɡuǎn mɑ？ 这是图书馆吗？ Is this a library?
呢 is mostly used to turn statements into queries.
fànɡjià le, nǐ wèishénme bù chqu wán’ér ne？ 放假 了，你 为什么 不 出去 玩儿 呢？ It’s holiday time. Why not go out for fun? wǒ jiào lǐqiánɡ, nǐne？ 我 叫 李强，你呢？ My name is Li Qiang. What about you?
If you want to know the details of the usage of 吗， you can read this quora post: http://chinesewords.quora.com/Usage-of-Chinese-particle-%E5%90%97-ma
Basically, this word has no meaning. Chinese usually use this at the very end of a interrogative sentence. It won't affect the meaning of the sentence if you ignore this word.
e.g. '我该不该去那里?' is equal to '我该不该去那里呢?' (Should I go there or not?)
啊 呀 么
Two usage of 呢
他还在睡呢!(He is still sleeping!)
我还没完成呢!(I haven't finish this yet!)
in this case, use of 呢 usually soften the question a bit
a and b both means "what are you doing?", but b is more slightly
one more usage is to mark the sentence(usually very short, or part of a sentence) as a question(sorry I can't find a proper way to describe this more accurate)
1.车呢？(where is the car?)
2.他人呢？(where is him?)
3.我在学中文，你呢？(I'm learning Chinese, what about you?)