否则 (fǒuzé) and 要不然 (yàobùrán) both mean "otherwise" or "or else" in Mandarin. You use them to warn someone about what will happen if they don't act — state what should happen first, then add the bad result.
The structure is: Clause A, 否则/要不然 + Clause B. Use 否则 in more formal contexts and 要不然 when you're speaking casually.
Key example: 你应该早点出发，否则会赶不上火车 (nǐ yīng gāi zǎo diǎn chū fā, fǒu zé huì gǎn bú shàng huǒ chē) — "You should leave earlier, otherwise you won't catch the train."
Notice the order: first the advice (leave earlier), then the consequence (won't catch the train). You always set up what should happen before introducing the warning.
In this HSK 4 speaking lesson, you talk out loud with AI teacher Mei Lin in real time — voice, not typing. The lesson focuses on Warnings and Consequences, so you'll practice building sentences that warn about outcomes using both 否则 and 要不然. Mei Lin corrects your grammar and pronunciation in the flow of conversation and adapts to your level. Each lesson targets one grammar pattern and takes about 10 minutes.
For more intermediate grammar, explore the full set of HSK 4 lessons. You can also build handwriting skills with the free printable Chinese worksheet generator. When you're ready, move on to another HSK 4 live lesson on 却 (què).
The first lesson is free to start — begin talking with Mei Lin and see how these warning patterns feel in real conversation.
否则 (fǒuzé) is more formal, while 要不然 (yàobùrán) is casual and conversational. Both mean "otherwise" or "or else" and follow the same structure: state what should happen, then add the consequence. In the Warnings and Consequences lesson, you'll practice both so you can choose the right one for the situation.
Each live conversation lesson targets one grammar pattern — in this case, 否则 / 要不然 (fǒuzé / yàobùrán) — and takes roughly 10 minutes. You'll talk with Mei Lin by voice and get corrections in real time.
Yes, the first lesson can be tried free. You talk out loud with Mei Lin and practice "Otherwise / Or Else" sentences without needing to type or study flashcards first.