想⋯⋯就⋯⋯
xiǎng …… jiù ……
Expressing "as one likes" with "jiu"
Repeating a question word around 就 means "whatever/wherever you like".
想 + Question Word + 就 + same Question Word
How it works
想去哪儿就去哪儿 — go wherever you want. The same question word appears twice, once in each half.
It works across the set: 想吃什么就吃什么, 想什么时候来就什么时候来.
The effect is permissive, sometimes indulgent — it grants total freedom.
Examples
xiǎng qù nǎr jiù qù nǎr
想去哪儿就去哪儿。
Go wherever you like.
nǐ xiǎng chī shén me jiù chī shén me
你想吃什么就吃什么。
Eat whatever you want.
xiǎng shén me shí hou lái jiù shén me shí hou lái
想什么时候来就什么时候来。
Come whenever you like.