\tBù (\u4e0d) and Méi (\u6ca1) are both negative words. I listed several situations to help you use them properly. But remember, there are always overlapsand exceptions.<\/p>\n
\t1. For expressing "don't have" and "there isn't or there aren't", you must use "méi y\u01d2u" or "méi ". You can not use "bù". "méi "is the shorter term for "méi y\u01d2u", usually you can replace each other.<\/p>\n
\tFor example:
\tw\u01d2 méiy\u01d2u shíji\u0101n. \u6211\u6ca1\u6709\u65f6\u95f4\u3002
\tw\u01d2 méiy\u01d2u qián. \u6211\u6ca1\u6709\u94b1\u3002
\tw\u01d2 méi kòng . \u6211\u6ca1\u7a7a\u3002
\ty\u012bngguó méiy\u01d2u dàxióngm\u0101o. \u82f1\u56fd\u6ca1\u6709\u5927\u718a\u732b(giantpanda)\u3002<\/p>\n
\t2. "bu" is usually used to describe the change of the state of something, but "mei" is usually to describe a negative fact.<\/p>\n
\ta) ch\u0113 bù z\u01d2u le . \u8f66\u4e0d\u8d70\u4e86\u3002(The car was going before, but now it is not going any longer.)
\tch\u0113 méi z\u01d2u. \u8f66\u6ca1\u8d70\u3002\uff08The car is there. It hasn't gone yet.\uff09<\/p>\n
\tb) ti\u0101n bú xiày\u01d4le. \u5929\u4e0d\u4e0b\u96e8\u4e86\u3002(It was raining before, but now it is not raining any longer.)
\tti\u0101n méi xiày\u01d4. \u5929\u6ca1\u4e0b\u96e8\u3002(It hasn't rained. It didn't rain.)<\/p>\n
\t3. When you describe somthing that hasn't taken place, you can use "méi y\u01d2u".<\/p>\n
\tFor example:
\tt\u0101 méiy\u01d2u lái . \u4ed6\u6ca1\u6709\u6765\u3002
\tw\u01d2 méiy\u01d2u ch\u012bfàn . \u6211\u6ca1\u6709\u5403\u996d\u3002
\tw\u01d2 méiy\u01d2u sh\u014dudào t\u0101de diànz\u01d0yóujiàn. \u6211\u6ca1\u6709\u6536\u5230\u4ed6\u7684\u7535\u5b50\u90ae\u4ef6\u3002<\/p>\n
\t4. When you describe something has taken place and the change of state which is a negative one, such as disappeared, you use "méi".<\/p>\n
\tFor example:
\tpíji\u01d4 méiy\u01d2u le. \u5564\u9152\u6ca1\u6709\u4e86\u3002(In this context, we usually use "le" in the end of the sentence.)<\/p>\n
\t5. When it is a personal decision and willingness, you use "bù".<\/p>\n
\tFor example:
\tt\u0101 bù lái le . \u4ed6\u4e0d\u6765\u4e86\u3002(It means he has decided not to come.)
\tt\u0101 méi lái. \u4ed6\u6ca1\u6765\u3002(It just describes the fact that he didn't come.)
\tw\u01d2 bù ch\u012bfàn . \u6211\u4e0d\u5403\u996d\u3002(It means I don't want to eat.)
\tw\u01d2 bù x\u01d0hu\u0101n m\u011biguó píji\u01d4. \u6211\u4e0d\u559c\u6b22\u7f8e\u56fd\u5564\u9152\u3002 (It means I don't like to drink American beer.)<\/p>\n
\t6. When you give a negative judgment to the state, attribute or manner of a certain thing or a fact, you use "bù".<\/p>\n
\tFor example:
\tw\u01d2 juéde m\u011biguó de píji\u01d4 bùh\u01ceo . \u6211\u89c9\u5f97\u7f8e\u56fd\u7684\u5564\u9152\u4e0d\u597d\u3002
\tt\u0101 xi\u011bde zì bùh\u01ceo. \u4ed6\u5199\u7684\u5b57\u4e0d\u597d\u3002 <\/p>\n