duì
Correct
不行
No / not allowed
Literally "not OK": 不 (bù) means "not," and 行 (xíng) means "OK" or "workable." Together they form a fixed expression for refusal.
不可以
bù kě yǐ
may not / not allowed — More formal and often used in rules or prohibitions.
没办法
méi bàn fǎ
there's no way / can't be helped — More casual and softer, often used to express inability rather than refusal.
不行了
bù xíng le
it's not working anymore / can't go on — Indicates a change of situation, often used when something was previously possible but now isn't.
你能帮我吗?
nǐ néng bāng wǒ ma?
Can you help me?
不行。
bù xíng.
No, I can't.
Appropriate
Avoid when
It depends on the context. For refusing or saying something is not allowed, use 不行 (bù xíng). For negating a fact, use 不是 (bú shì).
It is pronounced 'bù xíng' with a falling tone on 'bù' and a rising tone on 'xíng'.
不行 is more colloquial and direct, while 不可以 is more formal and often used in rules or prohibitions. In casual speech, 不行 is more common.
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