"vault backup: 2026-01-22 22:19:47 from Flow"

20-Knowledge/Synthesized-Chinese-Class-Notes.md

@@ -60,6 +60,14 @@ This note is a synthesized compilation of all Chinese class notes from the `10-I
     - **又 (yòu)**: Used for an action that happened again in the **past**.
     - **再 (zài)**: Used for an action that will happen again in the **present or future**.
 
+- **都 (dōu) vs. 才 (cái)** - *Added: 2026-01-15*:
+	- **都 (dōu)** can be used to express a negative or anxious feeling about something being "already" a certain way. It emphasizes the speaker's subjective feeling rather than just the fact.
+		- *Example*: 我都二十四岁了 (Wǒ dōu èrshísì suìle) - I'm *already* 24 years old (and I feel it's old).
+		- *Example*: 都九点了，我需要回家！(Dōu jiǔ diǎnle, wǒ xūyào huí jiā!) - It's *already* 9pm, I need to go home!
+	- **才 (cái)** is used to express a positive feeling about something being "only" a certain way, suggesting the speaker feels it's early, young, or a small amount.
+		- *Example*: 我才三十岁 (Wǒ cái sānshí suì) - I'm *only* 30 years old (and I feel young).
+		- *Example*: 才九点，我们继续玩儿吧! (Cái jiǔ diǎn, wǒmen jìxù wán'er ba!) - It's *only* 9pm, let's keep playing!
+
 ## Vocabulary
 
 ### Nouns