如果…就…: if… then…
复句 / complex sentences (假设)
Tone colorsā tone 1á tone 2ǎ tone 3à tone 4a neutral
如果 + condition，(Subject) + 就 + result
如果 introduces a condition, 就 the consequence. 就 is an adverb: it goes after the subject of the second clause, before the verb.
的话 is often added at the end of the condition, especially in speech: 如果你不喜欢的话，就退了吧.
In speech 如果 itself can be dropped: 你不喜欢，就退了吧.
Examples
如果你不满意，就可以退货。
Rúguǒ nǐ bù mǎnyì, jiù kěyǐ tuìhuò.If you're not satisfied, you can return it.
如果今天下单，明天就能到。
Rúguǒ jīntiān xiàdān, míngtiān jiù néng dào.If you order today, it'll arrive tomorrow.
如果有问题的话，你就给我打电话。
Rúguǒ yǒu wèntí dehuà, nǐ jiù gěi wǒ dǎ diànhuà.If there's any problem, give me a call.
如果太贵，我就不买了。
Rúguǒ tài guì, wǒ jiù bù mǎi le.If it's too expensive, I won't buy it.
Common mistakes
✗ 如果太贵，就我不买 → ✓ 如果太贵，我就不买 (就 after the subject).
就 is an adverb, not a conjunction like "then" in English.