只有...
Reach for this when you want to mark something as the sole option, sole condition, or sole person — 'only X.' 只有 narrows the scope: only this much, only him, only when this happens. Often paired with 才 in the second clause to say 'only if X, then Y.' Neutral register — works across speech, writing, news, and instructions. Common contexts: stating restrictions ('only members'), exclusive conditions ('only by working hard'), and limited quantities ('only three left').
Structure
只有 + Noun/Clause + (Subject + 才 + V)
zhǐ yǒu...
How to Think About It
只有 narrows; 才 closes the loop. When 只有 introduces a condition, the consequence almost always uses 才 ('only then will...'). Without 才, you lose the 'exclusive condition' feel. 只有 also works alone as 'only / there's only' for quantities: 只有三个 ('there are only three'). The two uses share the same word but different shapes — quantity stands alone, condition pairs with 才.
Examples
教室里只有一个学生。
Jiàoshì lǐ zhǐ yǒu yīgè xuéshēng.
There's only one student in the classroom.
只有多练习，才能说得流利。
Zhǐ yǒu duō liànxí, cái néng shuō de liúlì.
Only by practicing more can you speak fluently.
我只有十块钱。
Wǒ zhǐ yǒu shí kuài qián.
I only have ten yuan.
只有他知道密码。
Zhǐ yǒu tā zhīdào mìmǎ.
Only he knows the password.
Common Mistake
Learners use 就 instead of 才 in the result clause. 就 sounds prompt and easy; 才 sounds restrictive and 'only then.' 只有 needs 才 to convey 'this is the only way': 只有努力，才能成功 — not 只有努力，就能成功.
只有努力，就能成功。
只有努力，才能成功。
Don't Confuse With
只要...就...
'As long as X, then Y' — X is a SUFFICIENT condition (one of possibly several ways). 只有...才... makes X a NECESSARY condition (the only way). Big logical difference.
只是
'Just / merely' — softens a statement ('I'm just asking'). 只有 says there's only X and nothing else; 只是 says it's merely X and not something bigger.
唯一
'The only one (as an adjective)' — modifies a noun ('my only friend' = 我唯一的朋友). 只有 is a connective/restrictor that applies to clauses or quantities.
Practice
Fill in: ___ 坚持锻炼，___ 能保持健康。
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只有...才
Translate to Chinese: There are only two apples left.
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只有两个苹果了。
Arrange: 只有 / 才 / 你 / 能 / 努力 / 进步
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只有努力，你才能进步。
Use 只有...才... to describe a condition someone must meet to succeed at something.
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只有早睡早起，才能身体好。
Hear It in Real Episodes
This pattern appears in 1 Fluentide episode. Press play to hear the sentence:
只有他可以坐在这个椅子上。
Only he could sit on this chair.
Iran Searches for Leader After KhameneiBeginner
Related Grammar Patterns
Acquire by listening
Hear 只有... in real Chinese, not in a textbook.
Fluentide picks the next news episode at your level, so this pattern shows up again and again in real context. The transcript marks it, the audio drills it. Free to start.