When do I use 就 vs 才 with time expressions?

Use 就 to emphasize that an event happened earlier than expected (e.g., 他八点就到了 'He arrived as early as 8'). Use 才 to emphasize that an event happened later than expected (e.g., 他八点才到 'He only arrived at 8'). The choice changes the speaker's evaluation of the timing.

When do I use 就 vs 才 with quantities?

Use 就 to indicate the quantity is small enough or sufficient (e.g., 十块钱就够了 'Ten yuan is enough'). Use 才 to indicate the quantity is larger than expected or barely sufficient (e.g., 十块钱才够 'Ten yuan is barely enough'). The speaker's attitude differs: 就 is often positive, 才 often negative.

Can 就 and 才 be used in the same sentence?

Yes, in structures like 一…就… (as soon as) and 才…就… (no sooner...than), and also in contrastive sentences like 他七点就来了，我七点才到 ('He came as early as 7, I only arrived at 7').

How do I say 'only if' in Chinese?

Use the structure 只有…才 (zhǐyǒu...cái), not 只要…就 (which means 'as long as'). For example, 只有努力才能成功 means 'Only by working hard can one succeed'. 只要努力就能成功 means 'As long as you work hard, you will succeed'.

Easily confusedHSK 3

就 vs 才 (jiù vs cái): how expectation changes meaning

就 and 才 are adverbs that mark a contrast between the speaker's expectation and reality. 就 indicates something happened earlier, easier, or with a smaller quantity than expected (implying sufficiency or early completion). 才 indicates something happened later, harder, or with a larger quantity than expected (implying insufficiency or delay). They are not interchangeable; swapping them reverses the speaker's attitude about timing, quantity, or ease.

就 and 才 are adverbs that modify the speaker's evaluation of an event or quantity relative to an expectation. 就 shifts the expectation down: the event happened sooner, more easily, or the quantity is smaller than expected, often with a sense of sufficiency or pleasant surprise. 才 shifts the expectation up: the event happened later, with more difficulty, or the quantity is larger than expected, often with a sense of insufficiency or struggle. They are not interchangeable; the choice of 就 or 才 completely changes the message's attitude about timing, number, or ease.

When to use each

就jiù

as early as / already / only (with quantity)

Use 就 to emphasize that something occurs earlier or more easily than expected, or that a quantity is smaller than expected (implying sufficiency). Also use 就 as the standard 'then' in if-then conditionals (如果…就). In sentences with numbers, 就 often conveys 'only' or 'just' with a tone of satisfaction at the smallness.

就 often carries a positive or neutral evaluation of earliness/ease/smallness, but can also be used neutrally. With numbers, it implies the amount is enough or surprisingly little.

才cái

only then / not until / just

Use 才 to emphasize that something occurs later or with more difficulty than expected, or that a quantity is larger than expected (implying insufficiency or bare sufficiency). Also use 才 in 'only if' conditionals (只有…才) and after a long delay (终于…才). In sentences with numbers, 才 often conveys 'as much as' or 'barely' with a tone of struggle or surprise at the largeness.

才 often carries a negative or surprised evaluation of lateness/difficulty/largeness. With numbers, it implies the amount is barely sufficient or more than hoped for.

At a glance

	就	才
Core meaning	Earlier/sooner/easier than expected; quantity smaller than expected; sufficiency	Later/harder than expected; quantity larger than expected; insufficiency
With numbers/quantity	Implies sufficiency or surprise at smallness (e.g., 三块钱就够了 ‘3 yuan is enough’)	Implies insufficiency or surprise at largeness (e.g., 三块钱才够 ‘3 yuan is barely enough’ or ‘it takes as much as 3 yuan’)
Time sequence (finally)	就 cannot be used for ‘finally after a long time’; use 才 instead	才 is used for ‘only then/not until’ after a delay
Conditional ‘then’	就 is the standard word for ‘then’ in if-then sentences (如果…就)	才 is used for ‘only if’ in conditional sentences (只有…才)
Register	Neutral, common in all registers	Neutral, common in all registers

Examples

就
他7点就来了。
tā 7 diǎn jiù lái le
He came as early as 7 o'clock.
就 emphasizes earliness relative to expectation.
才
他7点才来。
tā 7 diǎn cái lái
He only came at 7 o'clock (later than expected).
才 emphasizes lateness relative to expectation.
就
五块钱就够了。
Wǔ kuài qián jiù gòu le.
Five yuan is enough.
就 implies sufficiency with a small amount.
才
五块钱才够。
Wǔ kuài qián cái gòu.
Five yuan is barely enough.
才 implies the amount is larger than desired or just sufficient.
就
如果下雨，我就不去。
Rú guǒ xià yǔ, wǒ jiù bú qù.
If it rains, then I won't go.
就 marks the consequence in a standard conditional.
才
只有努力才能成功。
Zhǐ yǒu nǔ lì cái néng chéng gōng.
Only by working hard can one succeed.
才 is used in a 'only if' conditional with 只有.

Common mistakes

Using 才 to indicate something happened earlier than expected (should be 就).
Using 就 to indicate something happened later than expected (should be 才).
Using 就 with numbers of time or quantity to imply insufficiency (should be 才).
Using 才 in standard if-then conditionals (if...then) where 就 is required.
Thinking 就 and 才 are interchangeable without changing meaning.

FAQ

When do I use 就 vs 才 with time expressions?: Use 就 to emphasize that an event happened earlier than expected (e.g., 他八点就到了 'He arrived as early as 8'). Use 才 to emphasize that an event happened later than expected (e.g., 他八点才到 'He only arrived at 8'). The choice changes the speaker's evaluation of the timing.
When do I use 就 vs 才 with quantities?: Use 就 to indicate the quantity is small enough or sufficient (e.g., 十块钱就够了 'Ten yuan is enough'). Use 才 to indicate the quantity is larger than expected or barely sufficient (e.g., 十块钱才够 'Ten yuan is barely enough'). The speaker's attitude differs: 就 is often positive, 才 often negative.
Can 就 and 才 be used in the same sentence?: Yes, in structures like 一…就… (as soon as) and 才…就… (no sooner...than), and also in contrastive sentences like 他七点就来了，我七点才到 ('He came as early as 7, I only arrived at 7').
How do I say 'only if' in Chinese?: Use the structure 只有…才 (zhǐyǒu...cái), not 只要…就 (which means 'as long as'). For example, 只有努力才能成功 means 'Only by working hard can one succeed'. 只要努力就能成功 means 'As long as you work hard, you will succeed'.