Questions & Answers about rúguǒ nǐ yǒu hǎo bànfǎ, jiù gàosu wǒ ba.
It is a very common if...then... pattern in Mandarin.
- 如果 introduces the condition: 如果你有好办法 = if you have a good solution / idea
- 就 introduces the result: 就告诉我吧 = then tell me
In English, we often say just if... without explicitly saying then, but in Chinese, 就 is very common in this structure.
Yes, in this sentence 就 is best understood as then or in that case.
It does not mean only here.
It links the second clause to the condition in the first clause:
- 如果你有好办法,就告诉我吧。
- If you have a good idea, then tell me.
Depending on context, 就 can sometimes also give a slight feeling of go ahead and... or then simply...
Often, yes.
Mandarin speakers sometimes omit one of them when the meaning is already clear:
- 你有好办法,就告诉我吧。
- 如果你有好办法,告诉我吧。
Using both 如果 and 就 is very clear and very standard, especially for learners. It is a good full pattern to know.