只有 + Condition,Subject + 才 + Result
只有 (zhǐyǒu) paired with 才 (cái) forms a conditional structure meaning "only if… then…" It emphasizes that a particular result can happen under one specific condition and no other. This pattern is used when the speaker wants to highlight that the condition is both necessary and exclusive.
只有每天坚持练习,你的中文才会进步。
Zhǐyǒu měi tiān jiānchí liànxí, nǐ de Zhōngwén cái huì jìnbù.
Only by practicing every day will your Chinese improve.
只有拿到签证,我们才能出国旅行。
Zhǐyǒu ná dào qiānzhèng, wǒmen cái néng chūguó lǚxíng.
Only after getting a visa can we travel abroad.
只有他亲口说出来,我才会相信。
Zhǐyǒu tā qīnkǒu shuō chūlái, wǒ cái huì xiāngxìn.
Only if he says it himself will I believe it.