Formality: “Bùlùn” is considered neutral to slightly formal. It's very common in written Chinese, news reports, and formal speeches. In casual, everyday conversation, its close cousin 不管 (bùguǎn) is often preferred, though “bùlùn” is perfectly understood and still used.
Common Structures:
1. `不论 + [Question Word (谁, 什么, 哪里, 怎么…)]`: Used to cover all possibilities related to the question word.
e.g., `不论谁 (bù lùn shéi)` - no matter who
e.g., `不论什么 (bù lùn shénme)` - no matter what
2. `不论 + [Option A + 还是/或者 + Option B]`: Used to present a choice where either option leads to the same result.
3. `不论 + [Verb Phrase (V 不 V)]`: A common way to create an “A or not A” choice.