Conditions: 如果...就, 要是, 只要...就, 只有...才, 除非

Conditional sentences express an "if... then..." relationship. Chinese has several patterns for this, and choosing between them is mostly about what kind of condition you are describing. Is it a general possibility? A sufficient condition? The only condition? Each has its own word.

如果...就: the general "if... then"

如果 (rúguǒ, "if") is the most common and neutral way to introduce a condition. 就 (jiù, "then") appears in the result clause. Together they cover most everyday conditional sentences.

如果 + [Condition], 就 + [Result]

• 如果下雨，我们就不去了。(Rúguǒ xià yǔ, wǒmen jiù bù qù le.) -- If it rains, we won't go.
• 如果你有问题，就来问我。(Rúguǒ nǐ yǒu wèntí, jiù lái wèn wǒ.) -- If you have a question, come ask me.
• 如果明天天气好，我们就去爬山。(Rúguǒ míngtiān tiānqì hǎo, wǒmen jiù qù páshān.) -- If the weather is nice tomorrow, we'll go hiking.

就 can be dropped in casual speech when the meaning is clear, but keeping it in is always safe and sounds natural.

要是: the casual twin of 如果

要是 (yàoshi) means exactly the same as 如果 and also pairs with 就. The only real difference is register: 要是 is more casual and conversational, while 如果 works in both spoken and written Chinese.

• 要是你不来，我一个人去。(Yàoshi nǐ bù lái, wǒ yī ge rén qù.) -- If you don't come, I'll go by myself.
• 要是有机会，我很想去日本。(Yàoshi yǒu jīhuì, wǒ hěn xiǎng qù Rìběn.) -- If I get the chance, I'd really like to go to Japan.

In everyday conversation, 要是 and 如果 are fully interchangeable. Pick whichever feels natural. In writing, stick with 如果.

只要...就: "as long as... then"

只要 (zhǐyào) introduces a sufficient condition. It means that the condition alone is enough to guarantee the result, and nothing more is needed. The feeling is "as long as X, then Y will follow."

只要 + [Sufficient Condition], 就 + [Guaranteed Result]

• 只要努力，就能成功。(Zhǐyào nǔlì, jiù néng chénggōng.) -- As long as you work hard, you can succeed.
• 只要你来，我们就很高兴。(Zhǐyào nǐ lái, wǒmen jiù hěn gāoxìng.) -- As long as you come, we'll be happy.
• 只要有网络，就可以工作。(Zhǐyào yǒu wǎngluò, jiù kěyǐ gōngzuò.) -- As long as there's internet, you can work.

The key feeling of 只要 is sufficiency and ease. You are saying this one condition is all that is needed.

只有...才: "only if... then"

只有 (zhǐyǒu) introduces a necessary condition. The result cannot happen without this specific condition being met. Where 只要 says "this is enough," 只有 says "this is the only way."

只有 + [Necessary Condition], 才 + [Result]

• 只有努力，才能成功。(Zhǐyǒu nǔlì, cái néng chénggōng.) -- Only by working hard can you succeed.
• 只有你来，我才去。(Zhǐyǒu nǐ lái, wǒ cái qù.) -- Only if you come will I go.
• 只有多练习，汉语才会进步。(Zhǐyǒu duō liànxí, Hànyǔ cái huì jìnbù.) -- Only by practicing more will your Chinese improve.

The 只要/只有 contrast is one of the more important distinctions in this group. Both translate roughly as "only if" in English, but they point in opposite directions:

• 只要 = this condition is sufficient (easy bar to clear)
• 只有 = this condition is necessary (no other way)

Both use 就 or 才 in the result clause, which also signals the difference: 只要 pairs with 就, and 只有 pairs with 才.

除非: "unless"

除非 (chúfēi) means "unless" and introduces the one condition that would change the outcome. It often pairs with 否则 (fǒuzé, "otherwise") or 才 in the result clause.

除非 + [Exception Condition], 否则/才 + [Result]

• 除非你道歉，否则我不原谅你。(Chúfēi nǐ dàoqiàn, fǒuzé wǒ bù yuánliàng nǐ.) -- Unless you apologize, I won't forgive you.
• 除非下雨，我们才不去。(Chúfēi xià yǔ, wǒmen cái bù qù.) -- We won't go unless it rains.
• 除非你帮我，否则我做不完。(Chúfēi nǐ bāng wǒ, fǒuzé wǒ zuò bù wán.) -- Unless you help me, I won't be able to finish.

除非 is essentially the negative flip of 如果: instead of "if this happens, then that," it says "only if this doesn't happen does that hold." Use it when you want to name the single exception that would break the rule.

How they compare

Pattern	Meaning	Key feel
如果...就	If... then	General condition, neutral
要是...就	If... then	Same as 如果, casual speech
只要...就	As long as... then	Sufficient condition, easy bar
只有...才	Only if... then	Necessary condition, no other way
除非...否则/才	Unless...	Exception that would change everything

For everyday conversation, 如果...就 and 要是...就 handle most situations. 只要 and 只有 are worth distinguishing carefully since they look similar but mean opposite things. 除非 is less common but very useful when you need it, and once you learn the pattern it is easy to use.