Usages of

  shì 老师lǎoshīwǒ bú shì lǎoshī.
I am not a teacher.

Note how (falling tone) changes it's pronunciation to (rising tone) when followed by a falling tone.

zhè  rén  shì 老师lǎoshīzhè gè rén bú shì lǎoshī.
This person is not a teacher.
  yào cháwǒ bú yào chá.
I don’t want tea.
  chī 米饭mǐfànwǒ bù chī mǐfàn.
I don’t eat rice.
  yào shuǐ yào  bēi cháwǒ bú yào shuǐ,wǒ yào yì bēi chá.
I don’t want water; I want a cup of tea.
昨天zuótiān  gēn  shuō   néng zuótiān wǒ gēn tā shuō wǒ bù néng qù.
Yesterday I told her I couldn’t go.
因为yīnwèi  hěn máng, 所以suǒyǐ   néng gēn  一起yìqǐ  kàn 电影diànyǐngyīnwèi wǒ hěn máng, suǒyǐ wǒ bù néng gēn nǐ yìqǐ qù kàn diànyǐng.
Because I am very busy, I can’t go watch a movie with you.
如果rúguǒ   lái, 我们wǒmen jiù 明天míngtiān zài rúguǒ tā bù lái, wǒmen jiù míngtiān zài qù.
If she doesn’t come, we’ll go again tomorrow.
如果rúguǒ   dēng guān le,  jiù  kàn shūrúguǒ nǐ bǎ dēng guān le, wǒ jiù bù kàn shū.
If you turn off the light, I won’t read.
今天jīntiān  yǒu 事情shìqíng,   kàn 电影diànyǐngjīntiān wǒ yǒu shìqíng, bù qù kàn diànyǐng.
I have things to do today; I’m not going to watch a movie.
虽然suīrán   认识rènshi  de 同事tóngshì, 但是dànshì  xiǎng 认识rènshi suīrán tā bú rènshi wǒ de tóngshì, dànshì tā xiǎng rènshi tā.
Although she doesn’t know my coworker, she wants to get to know him.
   认识rènshi  jiǔ, 但是dànshì 我们wǒmen 常常chángcháng 一起yìqǐ  超市chāoshìwǒ hé tā rènshi bù jiǔ, dànshì wǒmen chángcháng yìqǐ qù chāoshì.
He and I haven’t known each other for long, but we often go to the supermarket together.
 以前yǐqián  dǒng zhè  意思yìsiwǒ yǐqián bù dǒng zhè gè yìsi.
I didn’t understand this meaning before.
  huì yòng,  可以kěyǐ gěi  kàn 一下yíxià mawǒ bù huì yòng, nǐ kěyǐ gěi wǒ kàn yíxià ma?
I don’t know how to use it; could you show me for a moment?
qǐng  认真rènzhēn de kàn, 然后ránhòu 告诉gàosu   dǒng  dǒngqǐng nǐ rènzhēn de kàn, ránhòu gàosu wǒ nǐ dǒng bù dǒng.
Please look carefully, then tell me whether you understand.
我们wǒmen 晚上wǎnshang 睡觉shuìjiào 以前yǐqián  kàn 电影diànyǐngwǒmen wǎnshang shuìjiào yǐqián bù kàn diànyǐng.
We don’t watch movies before going to sleep at night.
 一般yìbān 周末zhōumò  上班shàngbān, huì gēn 家人jiārén chī 午饭wǔfàntā yìbān zhōumò bú shàngbān, huì gēn jiārén chī wǔfàn.
She usually doesn't work on weekends and will have lunch with her family.
医生yīshēng shuō  de 身体shēntǐ  tài hǎo, yào zài 医院yīyuàn 休息xiūxiyīshēng shuō tā de shēntǐ bú tài hǎo, yào zài yīyuàn xiūxi.
The doctor said his health isn’t very good and that he needs to rest in the hospital.
明天míngtiān 我们wǒmen 提前tíqián shí 分钟fēnzhōng 出发chūfā, jiù  huì 迟到chídào lemíngtiān wǒmen tíqián shí fēnzhōng chūfā, jiù bú huì chídào le.
Tomorrow we'll set off ten minutes early, then we won't be late.
我们wǒmen shì zuò 地铁dìtiě  医院yīyuàn de, piào   guìwǒmen shì zuò dìtiě qù yīyuàn de, piào yě bú guì.
We went to the hospital by subway; the tickets weren’t expensive.
周末zhōumò     自行车zìxíngchē,  kāi chēzhōumò wǒ hé tā qí zìxíngchē, bù kāi chē.
On weekends she and I ride bicycles and don't drive.
我们wǒmen shì  自行车zìxíngchē  de,  shì zuò 地铁dìtiě  dewǒmen shì qí zìxíngchē qù de, bú shì zuò dìtiě qù de.
We went by bicycle, not by subway.
地铁dìtiě de piào  guì, 公交车gōngjiāochē de piào gèng 便宜piányidìtiě de piào bú guì, gōngjiāochē de piào gèng piányi.
Subway tickets are not expensive; bus tickets are even cheaper.
今年jīnnián 周末zhōumò  xiǎng gēn 家人jiārén zài jiā,  打算dǎsuàn 出去chūqù lejīnnián zhōumò wǒ xiǎng gēn jiārén zài jiā, bù dǎsuàn chūqù le.
This year on weekends I want to be at home with my family; I don't plan to go out.
今天jīntiān   kāi chē,  zuò 地铁dìtiějīntiān wǒ bù kāi chē, wǒ zuò dìtiě.
I'm not driving today; I'm taking the subway.
 shuō 最近zuìjìn 没有méiyǒu 消息xiāoxi,    知道zhīdàoTā shuō zuìjìn méiyǒu xiāoxi, wǒ yě bù zhīdào.
She said there’s no news recently; I don’t know either.
 记得jìde  de 名字míngzi, 可是kěshì   记得jìde  deWǒ jìde nǐ de míngzi, kěshì tā bù jìde wǒ de.
I remember your name, but she doesn’t remember mine.
 shuō zhè  安排ānpái hǎo, 可是kěshì   同意tóngyì, xiǎng 自己zìjǐ zài 安排ānpái 一下yíxiàTā shuō zhè gè ānpái hǎo, kěshì tā bù tóngyì, xiǎng zìjǐ zài ānpái yíxià.
He said this arrangement is good, but she doesn’t agree and wants to arrange it herself again.
Zhè  颜色yánsè  tài 合适héshì,  gèng 喜欢xǐhuan 蓝色lánsèZhè gè yánsè bú tài héshì, wǒ gèng xǐhuan lánsè.
This color isn’t quite suitable; I prefer blue.
  xiǎng huā tài duō qián mǎi 衣服yīfuWǒ bù xiǎng huā tài duō qián mǎi yīfu.
I don’t want to spend too much money on clothes.
图书馆Túshūguǎn 附近fùjìn de 咖啡kāfēi  guì,  常常chángcháng Túshūguǎn fùjìn de kāfēi bú guì, wǒ chángcháng qù.
Coffee near the library isn’t expensive; I often go there.
zhè  东西dōngxi  tài guì,  xiān 试试shìshizhè gè dōngxi bú tài guì, wǒ xiān shìshi.
This thing isn’t too expensive; I’ll try it first.
zhè jiàn 事情shìqíng 看起来kànqǐlái hěn 容易róngyì, 但是dànshì zuò 起来qǐlái  容易róngyìzhè jiàn shìqíng kànqǐlái hěn róngyì, dànshì zuò qǐlái bù róngyì.
This matter looks easy, but doing it isn’t easy.
  知道zhīdào 怎么zěnme yòng zhè  手机shǒujī,  可以kěyǐ jiāo  mawǒ bù zhīdào zěnme yòng zhè gè shǒujī, nǐ kěyǐ jiāo wǒ ma?
I don’t know how to use this phone; could you teach me?
 以为yǐwéi   lái le, 但是dànshì  终于zhōngyú dào lewǒ yǐwéi tā bù lái le, dànshì tā zhōngyú dào le.
I thought she wasn’t coming, but she finally arrived.
其实qíshí zhè  问题wèntí  nán, bié 担心dānxīn,  试试shìshi jiù dǒng leqíshí zhè gè wèntí bù nán, bié dānxīn, nǐ shìshi jiù dǒng le.
Actually this question isn’t hard; don’t worry—try and you’ll get it.
  知道zhīdào 怎么办zěnmebàn,  jiù gēn   公园gōngyuán 聊天liáotiāntā bù zhīdào zěnmebàn, wǒ jiù gēn tā qù gōngyuán liáotiān.
She doesn’t know what to do, so I went to the park with her to chat.
 其实qíshí 以为yǐwéi   huì lái, 可是kěshì  已经yǐjīng dào letā qíshí yǐwéi wǒ bú huì lái, kěshì wǒ yǐjīng dào le.
He actually thought I wouldn’t come, but I’ve already arrived.
 yuē  明天míngtiān zài 图书馆túshūguǎn 见面jiànmiàn, 只要zhǐyào  lěng  jiù  自行车zìxíngchē tā yuē wǒ míngtiān zài túshūguǎn jiànmiàn, zhǐyào bù lěng wǒ jiù qí zìxíngchē qù.
She asked me to meet at the library tomorrow; as long as it isn’t cold, I’ll bike there.
如果rúguǒ 下雨xiàyǔ, 我们wǒmen jiù   le, 怎么办zěnmebànrúguǒ xiàyǔ, wǒmen jiù bú qù le, zěnmebàn?
If it rains, then we won’t go; what should we do?
晚上wǎnshang 我们wǒmen  kàn 电视diànshì, zhǐ tīng 音乐yīnyuèwǎnshang wǒmen bù kàn diànshì, zhǐ tīng yīnyuè.
In the evening we don’t watch TV, we only listen to music.
  kàn 新闻xīnwén, gèng 喜欢xǐhuan kàn 电影diànyǐng  电视diànshì 节目jiémùTā bù kàn xīnwén, gèng xǐhuan kàn diànyǐng hé diànshì jiémù.
She doesn’t watch the news; she prefers watching movies and TV shows.
 决定juédìng  参加cānjiā 这个zhège 考试kǎoshìTā juédìng bù cānjiā zhège kǎoshì.
She decided not to take this exam.
这些zhèxiē 生词shēngcí  duō, 但是dànshì yòng zài 句子jùzi   tài 容易róngyìzhèxiē shēngcí bù duō, dànshì yòng zài jùzi lǐ bù tài róngyì.
These new words are not many, but using them in sentences is not very easy.
 de 房间fángjiān  , 但是dànshì yǒu liǎng  窗户chuānghu, hěn 舒服shūfuWǒ de fángjiān bù dà, dànshì yǒu liǎng gè chuānghu, hěn shūfu.
My room isn’t big, but it has two windows and is very comfortable.
  喜欢xǐhuan zài 房间fángjiān 上网shàngwǎng, 觉得juéde zài 公园gōngyuán  gèng 舒服shūfuTā bù xǐhuan zài fángjiān shàngwǎng, juéde zài gōngyuán lǐ gèng shūfu.
She doesn’t like going online in her room; she feels it’s more comfortable in the park.
周末zhōumò 我们wǒmen  xiǎng  聚会jùhuì, zhǐ xiǎng zài jiā 休息xiūxizhōumò wǒmen bù xiǎng qù jùhuì, zhǐ xiǎng zài jiā xiūxi.
On weekends we don’t want to go to parties; we just want to rest at home.
 觉得juéde zuò 中文zhōngwén 作业zuòyè  tài 简单jiǎndānTā juéde zuò zhōngwén zuòyè bù tài jiǎndān.
He thinks doing Chinese homework is not very easy.
老师Lǎoshī shuō 这些zhèxiē 作业zuòyè 虽然suīrán  duō, 但是dànshì hěn 重要zhòngyào, 必须bìxū 做完zuòwánLǎoshī shuō zhèxiē zuòyè suīrán bù duō, dànshì hěn zhòngyào, bìxū zuòwán.
The teacher said that although there isn’t much homework, it’s very important and must be finished.
 hái  tài 习惯xíguàn 这么zhème zǎo 起床qǐchuángWǒ hái bù tài xíguàn zhème zǎo qǐchuáng.
I’m still not quite used to getting up this early.
 shuō 即使jíshǐ 考试kǎoshì hěn nán,   xiǎng 放弃fàngqìTā shuō jíshǐ kǎoshì hěn nán, yě bù xiǎng fàngqì.
He said that even if the exam is very hard, he doesn’t want to give up.
为了Wèile 健康jiànkāng, 医生yīshēng shuō 我们wǒmen 即使jíshǐ máng   néng 放弃fàngqì chī 早饭zǎofàn de 习惯xíguànWèile jiànkāng, yīshēng shuō wǒmen jíshǐ máng yě bù néng fàngqì chī zǎofàn de xíguàn.
For the sake of our health, the doctor said that even if we’re busy we must not give up the habit of eating breakfast.
  tài tīng de 清楚qīngchu,  可以kěyǐ zài 慢慢mànmàn de shuō 一下yíxià maWǒ bù tài tīng de qīngchu, nǐ kěyǐ zài mànmàn de shuō yíxià ma?
I can’t quite hear clearly; could you say it slowly again?
 de 声音shēngyīn hěn xiǎo, zài 公园gōngyuán   容易róngyì 听清楚tīngqīngchu, 比如bǐrú 刚才gāngcái  jiù méi 听懂tīngdǒngTā de shēngyīn hěn xiǎo, zài gōngyuán lǐ bù róngyì tīngqīngchu, bǐrú gāngcái wǒ jiù méi tīngdǒng.
Her voice is very soft, so in the park it’s not easy to hear clearly; for example, just now I didn’t understand her.
 平时píngshí hěn 关心guānxīn 别人biéren, 声音shēngyīn  总是zǒngshì  Tā píngshí hěn guānxīn biéren, shēngyīn yě zǒngshì bù dà.
He usually really cares about other people, and his voice is also always not loud.
  喜欢xǐhuan 别人biéren bāng  zuò 作业zuòyèwǒ bù xǐhuan biéren bāng wǒ zuò zuòyè.
I don’t like other people helping me with my homework.
  xiǎng ràng 别人biéren bāng  zuò 作业zuòyètā bù xiǎng ràng biéren bāng tā zuò zuòyè.
She doesn’t want other people to help her do homework.
  tài 喜欢xǐhuan 跑步pǎobù, 但是dànshì 觉得juéde zuò 一点儿yìdiǎnr 运动yùndòng duì 健康jiànkāng hěn hǎowǒ bú tài xǐhuan pǎobù, dànshì juéde zuò yìdiǎnr yùndòng duì jiànkāng hěn hǎo.
I don’t really like running, but I think doing a bit of exercise is very good for health.
  喜欢xǐhuan zuò 电梯diàntī, 每次měicì dōu zǒu 楼梯lóutī 下楼xiàlóu huí 公寓gōngyùtā bù xǐhuan zuò diàntī, měicì dōu zǒu lóutī xiàlóu huí gōngyù.
She doesn’t like taking the elevator; every time she walks down the stairs back to the apartment.
周末zhōumò   上班shàngbān, zài jiā 洗澡xǐzǎo、  衣服yīfu, hái 打扫dǎsǎo 厨房chúfángzhōumò tā bú shàngbān, zài jiā xǐzǎo, xǐ yīfu, hái dǎsǎo chúfáng.
On weekends she doesn’t work; she stays home to shower, wash clothes, and also clean the kitchen.
 一点儿yìdiǎnr   害怕hàipà zài zhè tiáo 马路mǎlù shàng zǒu, 因为yīnwèi 晚上wǎnshang  hěn 安全ānquánwǒ yìdiǎnr yě bú hàipà zài zhè tiáo mǎlù shàng zǒu, yīnwèi wǎnshang yě hěn ānquán.
I’m not afraid at all to walk on this road, because it’s also very safe at night.
 一点儿yìdiǎnr   生气shēngqì, zhǐ 觉得juéde zhè jiàn 事情shìqíng 有点儿yǒudiǎnr 奇怪qíguàitā yìdiǎnr yě bù shēngqì, zhǐ juéde zhè jiàn shìqíng yǒudiǎnr qíguài.
She isn’t angry at all; she just thinks this matter is a bit strange.
 de 想法xiǎngfǎ gēn  de 一样yíyàng, dōu  愿意yuànyì 放弃fàngqì 学习xuéxí 中文zhōngwéntā de xiǎngfǎ gēn wǒ de yíyàng, dōu bú yuànyì fàngqì xuéxí zhōngwén.
Her way of thinking is the same as mine; neither of us is willing to give up studying Chinese.
 zhù de 公寓gōngyù  , 但是dànshì 环境huánjìng yòu 安静ānjìng yòu 安全ānquánwǒ zhù de gōngyù bú dà, dànshì huánjìng yòu ānjìng yòu ānquán.
The apartment I live in isn’t big, but the environment is both quiet and safe.
  xiǎng huā tài duō qián mǎi xīn 衣服yīfuwǒ bù xiǎng huā tài duō qián mǎi xīn yīfu.
I don’t want to spend too much money on new clothes.
zhè     超市chāoshìzhè cì wǒ bù qù chāoshì.
This time I’m not going to the supermarket.
 说话shuōhuà de 声音shēngyīn hěn xiǎo,  tīng  tài 清楚qīngchutā shuōhuà de shēngyīn hěn xiǎo, wǒ tīng bù tài qīngchu.
His voice is very soft when he speaks, and I can’t quite hear clearly.
zhè  房间fángjiān 打扫dǎsǎo 起来qǐlái  tài 容易róngyìzhè gè fángjiān dǎsǎo qǐlái bù tài róngyì.
This room is not very easy to clean.
我们wǒmen zǒu 楼梯lóutī 上楼shànglóu,  zuò 电梯diàntīwǒmen zǒu lóutī shànglóu, bù zuò diàntī.
We go upstairs by the stairs and don’t take the elevator.
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