HSK 6
⋯⋯，要不然/不然⋯⋯
⋯ ⋯ ， yào bù rán / bù rán ⋯ ⋯
要不然/不然
Explanation
'要不然' (yào bù rán) and '不然' (bù rán) are conjunctions (words linking clauses) placed at the beginning of the second clause, with two meanings depending on context.
Clause 1，要不然/不然 + Clause 2. Meaning (a) "otherwise...": states a consequence (usually bad) when what is in Clause 1 is not carried out — 要认真，不然会影响毕业 (you must be serious, otherwise it will affect graduation). Meaning (b) colloquial "how about.../ well then...": offers a suggestion, an alternative option — 不然我和你一起去 (how about I go with you).
Meaning (a) is used in a hypothetical compound sentence (a sentence with a condition-consequence clause) to warn of a consequence. Meaning (b) is used in everyday conversation to suggest another solution.
To know whether it is meaning (a) or (b), look at the following clause: if it is a bad consequence → "otherwise"; if it is a suggestion/option → "how about, well then". 要不然 and 不然 are interchangeable, with 不然 being shorter and more common.
Translating it rigidly as "otherwise" in meaning (b) too makes the sentence illogical (the sentence 不然我和你一起去 is not "otherwise I'll go with you" but "how about I go with you"). You need to rely on the context of the following clause to choose the meaning.
Examples
Everyone must take the exam seriously, otherwise it will affect graduation.
You don't need to worry too much; how about I go with you.
It's raining outside, so let's just go tomorrow instead.
Practice
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Learn “⋯⋯，要不然/不然⋯⋯” effectively
The grammar point “⋯⋯，要不然/不然⋯⋯” (要不然/不然) is one of the key structures at HSK 6. To use it fluently, you need to understand the contexts where it's used and practice regularly.
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