what is the Answer

In Chinese, "不" and "没" are both used to express negation but in different contexts. "不" is commonly used to negate actions, habits, qualities, or future scenarios. For example, "我不去" means "I won't go," and "他不吃饭" means "He doesn't eat." On the other hand, "没" is typically used to negate existence, possession, or the completion of past actions. For instance, "这里没有人" translates to "There's no one here," and "我没车" means "I don't have a car." While there can be some overlap, "不" is more about present/future denial and subjective feelings, whereas "没" focuses on past facts and existence.

不 - It is used for the present and future, habits, and general facts. It is not used for past actions.
没 - is used to negate past actions and completed actions, as well as "有" (to have).

1、Different focuses of negation
"不 (bù)" negates subjective will, attitude, habit, or nature, meaning "actively not wanting / not agreeing".
"没 (有) (méi (yǒu))" negates objectively occurring facts, the completion of an action, or the existence of something, meaning "objectively not happening / not existing".
2、Types of Verbs/Adjectives They Collocate With
"不 (bù)" can collocate with stative verbs (such as 喜欢 (xǐhuān, like), 相信 (xiāngxìn, believe), 愿意 (yuànyì, be willing)) and adjectives (such as 漂亮 (piàoliang, beautiful), 快 (kuài, fast)), expressing a long-term state or subjective judgment.
"没 (有) (méi (yǒu))" mostly collocates with action verbs (such as 吃 (chī, eat), 去 (qù, go), 看 (kàn, watch)), indicating that an action has not occurred or has not been completed; it can also be followed by a noun to express negation of existence (e.g., "没水 (méi shuǐ, there is no water)").
3、Different time associations
"不 (bù)" can be used in the present, future, and can also express habitual negation (without a clear time limit).
"没 (有) (méi (yǒu))" is mainly used for past or current objective results (emphasizing "not occurring within a period of time that has already happened").

不 we use it when we say sth in the future and 没 when we say in the past.

it all depends in the context, e.g ,"不要" means I don't want ."没有" means I don't have. ”不“和“没”通常会和其他字组合成一个词语，如 不要（don't want），不想(not thinking )，不看(don't look )，不听(don't listen)，不是(no). 没有（don't have），没钱(no money)，没吃(haven't eat)，没喝(haven't drink).要是你怕弄错，就听别人问你什么，别人问你什么你就答什么。e.g,你不要我了吗？（you don't want me any more?）,you would answer ,我要 or 我不要

I remember watching a great video about this topic:https://www.youtube.com/watch?v=6FLHLwQqiXY
summery if you don't want to watch the video:
1.
不有❌
没有✅
2.
不是✅
没是（not to be confused with 没事）❌
3.
不在（在is for location here)✅
没在✅
4.
不+verb=a habitual activity(like simple present in english)
没+verb=one time action in the past
5.
不+verb+past=subjective intention
没+verb+past=objective fact
你昨天为什么不打电话
你昨天为什么没打电话
6.
不+future✅
没+future❌
7.
不+adjective=describing a characteristic of something
没+adjective= there is not a change or a change that you expected
他不胖
他没胖
8.
不+noun❌
没+noun❌
if you ever see 没+noun, then 没is shorten for 没有

1. 不 (bù) = “not” (used for general, habitual, or future negation)
Use 不 when you talk about things that are:
habitual (what someone usually does or doesn’t do)
factual (general truths)
future or planned actions
adjectives or stative verbs
✅ Examples:
Chinese Pinyin English
我不吃肉。 Wǒ bù chī ròu. I don’t eat meat. (habit)
他不高。 Tā bù gāo. He’s not tall.
我明天不去。 Wǒ míngtiān bù qù. I’m not going tomorrow.
她不喜欢咖啡。Tā bù xǐhuan kāfēi. She doesn’t like coffee.
🌊 2. 没 (méi) = “did not / haven’t” (used for past or completed actions)
Use 没 when you talk about:
past actions that didn’t happen
“have not” done something
negating 有 (yǒu – to have)
✅ Examples:
Chinese Pinyin English
我昨天没去。 Wǒ zuótiān méi qù. I didn’t go yesterday.
他没吃饭。 Tā méi chī fàn. He didn’t eat.
我没有钱。 Wǒ méi yǒu qián. I don’t have money. / I’m broke.
我还没做作业。 Wǒ hái méi zuò zuòyè. I haven’t done my homework yet.
3. Key Differences at a Glance
Situation Use Example
Habit / general truth 不 我不喝酒。 (I don’t drink alcohol.)
Past action didn’t happen 没 我昨天没喝酒。 (I didn’t drink alcohol yesterday.)
Negating “have” (有) 没 我没有钱。
Adjectives / stative verbs 不 天气不冷。
Future / intention 不 明天我不去。
Common Mistakes
我没喜欢咖啡。 ❌
✅ 我不喜欢咖啡。 (Because “like” is a state, not a past event.)
昨天我不去。 ❌
✅ 昨天我没去。 (Because it’s a past event.)

不'Bu' is used for negation of actions or situations, while没 'mei' emphasizes the absence or non-existence of something."

One-sentence：Use 不 for present/future, habits, or volition; use 没 for past completion or existence.
1. 不 (bù)
Negates willingness, habitual actions, inherent qualities, or future events.
I don’t want to go. 我不去。
He doesn’t smoke. 他不抽烟。
The book isn’t good. 这本书不好。
I won’t come tomorrow. 明天我不来。
2. 没 (méi)
Negates that an action happened in the past or that something exists.
I didn’t go yesterday. 我昨天没去。
I haven’t seen that movie. 我没看过那部电影。
There’s no one in the classroom. 教室里没人。

不= it's used for present or future negation 没 = it's used for past actions or in present along with " 有"