Often, I come across sentences like below, where the subject is missing and the object is placed instead.

证件带了吗? (Instead of 你带了证件吗?)

I am wondering if there is a name to such grammatical structure, and if there are any conditions to be aware of when I want to use such structure. Thank you!


3 Answers 3


It's called topic-comment structure and it's ubiquitous in Chinese. It's one of its distinctive grammatical traits.

What is called topic, or theme, is the focus of the sentence and is extracted at the beginning of the sentence, regardless of its grammatical function. This last remark is especially important. The topic isn't necessarily also the grammatical subject of the sentence.

What is called comment, is usually what contains the predicate and provides the additional information about the topic that you want to convey. In wikipedia's words "it's what is being said about the topic".

When the topic is a complex structure, it's often separated from the rest by a comma in writing, and by a brief pause in speech. In writing the comma may disappear for simple topics. But you can add it again to test this:


证件 is the topic, and the grammatical object of the sentence. The two are not mutually exclusive.

(你)带了吗 is the comment, and the grammatical predicate. The actual subject 你 is omitted, as it's understood from the context (supposedly this sentence is being addressed at you).

Other examples where the topic is the object (with and without comma):

饭吃了吗 = Have you eaten already?

别人的中文名字,你一定要记住啊 = Make sure to remember other people's Chinese names!

  • Comments deleted; please be constructive when commenting.
    – Becky 李蓓
    Aug 14, 2020 at 10:35
  • Thank you! I really appreciate your detailed explanations, it helped me clear things up :)
    – Dimen
    Aug 14, 2020 at 13:58
  • huh, perhaps I'm a natural? Even though this is my first time seeing this grammar structure I may have used it accidently. About a month ago I texted a friend with a question about a few words, the message was as follows: "但"和"但是"和"只是",这三个词,是不是不一样的? Is this an example of topic-comment structure? Aug 14, 2020 at 14:59

Maybe I could answer the second question. Native users use these kind of sentences everyday.

  1. It's simple and straightforward but a little impolite to elders, your boss, strangers, etc. Please add 請問 to show your polite.

  2. Make sure the person you are talking to is the person should/could/may know the situation.














  • 車站怎麼走? is different from OP's example because 走车站 doesn't make sense.
    – dan
    Aug 14, 2020 at 8:26

I decide to retract my previous answer and add a new one.

In Chinese Grammar, there is a term called 无标记被动句 (Unmarked passive sentences), which means there is no marker(such as 被,让,把,etc) to indicate the passive voice in the sentence but it's actually passive voice. Your example 证件带了吗 demonstrates this characteristics.

So, 证件 is Subject and 带了吗 is Predicate.

Btw, the topic-comment structure is another way to see it, but 无标记被动句 is the term we are taught in schools for native speakers.

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