In Mandarin, when you want to say that something applies to an entire group of people or things, you use the adverb 都 (dōu). It’s a small but powerful word that gathers everyone and everything together under one idea.

Think of 都 as a way to say "all-inclusive." If the subject of your sentence is plural, like "we," "they," or "these books," adding 都 signals that whatever you're about to say is true for every single member of that group. It can mean "all" when referring to three or more items, and "both" when referring to two.

The most important rule for using 都 is its position in a sentence. Unlike in English where words like "all" can move around, 都 has a fixed spot: it always comes after the subject but before the verb.

The basic structure is: Subject + 都 + Verb Phrase.

Let’s look at an example. To say "We all like music," the subject is "we" (我们), and the verb is "like" (喜欢). The word 都 fits right between them.

Here, 都 emphasizes that everyone included in "we" likes music. It doesn't just mean some of us do; it means all of us do.

It works the same way for two people, where it translates to "both."

The most frequent error for learners is putting 都 in the wrong place. Because English is flexible ("All of us like music" or "We all like music"), it's tempting to put 都 at the beginning of the sentence. But in Mandarin, that doesn't work. The adverb must follow the noun or pronoun it modifies.

Always remember the simple rule: Subject, then 都, then the rest of the sentence. By placing 都 correctly after the subject, you ensure your meaning is clear and your grammar is accurate.