Writing Balance Rule: Draw a neat outer box with slightly inward-sloping vertical walls, then tuck two neat strokes inside before sealing the bottom line.
Tongue & Mouth Position: Tongue tip lightly touching behind lower front teeth, creating a narrow gap for air to hiss.
Final Rhyme
i (-i*)
Vowel Group: -a vowel group
Sounds like: apical vowel buzzing i sound
Note: Written as 'i (-i*)', pronounced as rounded 'i' [y].
Mouth Shape Guide: Combine initial 'zh-' (jr) with final '-i' (rr/zz).
Common Learner Trap: Do NOT pronounce '-i' as 'ee' after zh-! Keep your tongue in the consonant position and buzz 'rr/zz'.
Tone
T4 (51)
5 → 1 (51)
4th Tone (High-Falling)
Tone Pitch & Cadence: Tone 4 starts high and drops abruptly to the bottom, identical to an emphatic English 'No!' or 'Four!'.
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Listening trap: Beginners often confuse the apical retroflex/dental fricative vowels (like in sì) with English 'ee' or 'uh', or mix up the tone with Tone 2 (rising) due to rushing.
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Physical Tone Gesture: A sharp, forceful nod downwards, like chopping the air in half to command 'Stop!'.
3. Writing
Topology: Full enclosure · Strokes: 5 strokes
Writing Balance Rule: Draw a neat outer box with slightly inward-sloping vertical walls, then tuck two neat strokes inside before sealing the bottom line.
An outer enclosure (囗) protecting a human legs stance or breath pattern inside, historically evolving from tally marks or mouth representations.
囗 Outer container box
儿 Legs or internal strokes
Phonetic Family (形声字家族)
2· Phonetic Root: 四 (sì)
5. History
Liushu category: Indicative (指事)
Origin: In Oracle Bone scripts, four was originally written with four horizontal lines (III). Later, the shape was borrowed and enclosed inside a mouth or container glyph to represent the number four.
Semantic Evolution: Moved from four horizontal tally marks to an enclosed box shape representing the cardinal number four.
In Chinese culture, the number four (四 sì) sounds similar to the word for death (死 sǐ), making it an unlucky number in some contexts.
6. Sinosphere
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Kanji (Japanese)
On: シ / Kun: よ / よん
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Hanja (Korean)
사
7. Memory
Vivid Mnemonic Story
Picture a square enclosure (囗) with two little skiing legs (儿) inside, racing down the mountain slope to score a winning score of four!
Lookalikes & Traps (形近字)
西(xī)
西 means 'west' and has an open top with a curved interior, whereas 四 is fully sealed at the bottom.
死(sǐ)
死 means 'death' and adds a bone radical (歹) on the left side, whereas 四 is just the number four.
8. Mastery
Active Recall Challenge
我有[___]个好朋友。
Clue: sì
Common Learner Pitfall
Mistaking the square enclosure for the character for 'west' (西) or confusing the fourth tone with the second tone.
Memory Prompts
Recognition: What does 四 mean and how is it pronounced with tone?
Production: How do you write the number 'four' (sì) in Chinese characters?
Real-World Video Context
Watch authentic native speakers pronounce and explain this word in real-world YouTube videos.
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四sìfour
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