When do I use 趁 vs 乘?

Use 趁 in everyday speech for seizing a temporary condition (hot, young, early). Use 乘 in formal or literary contexts, especially in set phrases like 乘机 (seize the opportunity) or 乘势 (take advantage of momentum). If you're giving a casual instruction like 'eat while hot', only 趁 works.

Can 趁 and 乘 be used interchangeably?

No. They are not interchangeable in most contexts. 趁 is the spoken, flexible coverb; 乘 is formal and restricted to fixed expressions. While both can appear before 机 (opportunity), 趁机会 is spoken and 乘机 is written/formal. Using the wrong one sounds either too bookish or too casual.

乘 requires a noun like 机 or 势 to mean 'take advantage of'. It cannot be directly followed by an adjective like 热 (hot) to mean 'while hot'. That pattern is exclusive to 趁 (and its variant 趁着).

Is 乘 only used in idioms?

Not exclusively, but it is very common in idiomatic set phrases. In formal writing, 乘 can also be used with nouns like 机会 (e.g., 乘这个机会) or 时机, but such usage is still more literary than 趁. In modern spoken Chinese, 趁 is overwhelmingly preferred.

Easily confusedHSK 6

趁 vs 乘 (chèn vs chéng): which ‘take advantage of’ to use

Both 趁 (chèn) and 乘 (chéng) can mean "take advantage of (an opportunity)" in Chinese, but they differ in register and usage. 趁 is the everyday spoken word, used to seize a temporary condition (e.g., "while hot", "while young"). 乘 is its formal, literary counterpart, common in set phrases like 乘机 (seize the opportunity) and written Chinese. Choosing the wrong one can sound unnatural or overly bookish.

趁 and 乘 are both coverbs that express taking advantage of a favorable situation. 趁 (chèn) is the default choice in spoken Chinese, emphasizing a temporary condition (hot, young, daylight) that won't last. It is used flexibly before nouns or verb phrases. 乘 (chéng) has the same core meaning but is restricted to formal or literary contexts, usually in fixed combinations like 乘机 (seize an opportunity) or 乘势 (leverage momentum). Unlike 趁, 乘 can also mean 'ride' (a vehicle), a separate sense that does not overlap.

使い分け

趁chèn

take advantage of (while a condition lasts)

Use 趁 for informal, everyday situations where you seize a temporary state or condition. Common examples: 趁热吃 (eat while hot), 趁年轻 (while young), 趁这个机会 (take this opportunity). It can be followed by a noun (趁热), an adjective (趁早), or a verb phrase (趁有时间). 趁 is the go-to coverb in conversation and casual writing.

趁 can also function as a preposition meaning 'while (the condition lasts)' and is often interchangeable with 趁着 in the same sense. It does not carry the ride/vehicle meaning of 乘.

乘chéng

take (a chance)

Use 乘 in formal, literary, or idiomatic expressions to mean 'taking advantage of an opportunity'. It typically appears in set phrases like 乘机 (seize the opportunity), 乘势 (take advantage of momentum), or 乘胜 (while victorious). 乘 is rarely used alone with a temporary condition; instead it combines with abstract nouns like 机, 势, 胜. In very formal writing, 乘 can also appear with a verb (e.g., 乘隙而入 – exploit a gap), but such usage is narrow.

乘 has a completely separate meaning 'to ride' (乘公交车 – take the bus). When used in the 'opportunity' sense, it is almost never used in spoken commands like 'eat while hot' – that would be unnatural.

ひと目で分かる

	趁	乘
Register	Everyday spoken Chinese	Formal, literary Chinese
Typical grammatical pattern	趁 + [temporary condition/noun/verb phrase] + [action]	乘 + [abstract noun (机/势/胜)] + [verb]
Can be used for 'while hot'?	Yes: 趁热吃 (common)	No: 乘热吃 is unnatural and wrong in modern Chinese
Common in fixed idioms?	Less common; 趁早, 趁热 are phrases but not classical idioms	Very common: 乘机, 乘势, 乘胜, 乘虚而入

例文

趁
趁热吃吧。
Chèn rè chī ba.
Eat while it's hot.
Spoken command using a temporary condition – 趁 is correct.
趁
我们趁年轻多学点东西。
Wǒ men chèn nián qīng duō xué diǎn dōng xī.
Let's learn more while we are young.
趁 + adjective describing a transitory state.
乘
他乘机逃跑了。
Tā chéng jī táo pǎo le.
He took the opportunity to run away.
乘机 is a set phrase – 'seize the opportunity'.
乘
乘胜前进。
Chéng shèng qián jìn.
Advance while victorious.
Literary expression; not used in casual speech.
趁
趁这个机会，我想说一下。
Chèn zhè ge jī huì, wǒ xiǎng shuō yí xià.
Taking this opportunity, I want to say something.
趁 can be used with 机会 in spoken Chinese; 乘机 would be too formal here.
乘
✗他乘热吃了饭。
✗ Tā chéng rè chī le fàn.
He ate while it was hot.
Wrong: should be 趁热. 乘 cannot be used with a temporary condition like 'hot'.

よくある間違い

Using 乘 for 'while hot' or 'while young' (e.g., 乘热吃) – 趁 is required for temporary conditions.
Using 趁 in formal idioms like 乘机 or 乘势 – these are fixed with 乘 in literary Chinese.
Confusing the 'ride' meaning of 乘 (乘地铁, 乘飞机) with its 'take opportunity' sense; only the latter is similar to 趁.
Using 趁 alone without a condition to mean 'seize the opportunity' in a formal context where 乘机 is expected.

よくある質問

When do I use 趁 vs 乘?: Use 趁 in everyday speech for seizing a temporary condition (hot, young, early). Use 乘 in formal or literary contexts, especially in set phrases like 乘机 (seize the opportunity) or 乘势 (take advantage of momentum). If you're giving a casual instruction like 'eat while hot', only 趁 works.
Can 趁 and 乘 be used interchangeably?: No. They are not interchangeable in most contexts. 趁 is the spoken, flexible coverb; 乘 is formal and restricted to fixed expressions. While both can appear before 机 (opportunity), 趁机会 is spoken and 乘机 is written/formal. Using the wrong one sounds either too bookish or too casual.
Why is 乘热 wrong?: 乘 requires a noun like 机 or 势 to mean 'take advantage of'. It cannot be directly followed by an adjective like 热 (hot) to mean 'while hot'. That pattern is exclusive to 趁 (and its variant 趁着).
Is 乘 only used in idioms?: Not exclusively, but it is very common in idiomatic set phrases. In formal writing, 乘 can also be used with nouns like 机会 (e.g., 乘这个机会) or 时机, but such usage is still more literary than 趁. In modern spoken Chinese, 趁 is overwhelmingly preferred.