Usages of

 shì 学生xuéshēngwǒ shì xuéshēng.
I am a student.
  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.

 hěn hǎowǒ hěn hǎo.
I am very well.
 shì 中国zhōngguó rénwǒ shì zhōngguó rén.
I am Chinese.
 jiào 李雷lǐléiwǒ jiào lǐléi.
My name is Li Lei.
 zài jiāwǒ zài jiā.
I am at home.
 yǒu shuǐwǒ yǒu shuǐ.
I have water.
 没有méiyǒu cháwǒ méiyǒu chá.
I don’t have tea.
 yào cháwǒ yào chá.
I want tea.
 yào  shuǐwǒ yào hē shuǐ.
I want to drink water.
  yào cháwǒ bú yào chá.
I don’t want tea.
 yào chī 米饭mǐfànwǒ yào chī mǐfàn.
I want to eat rice.
  chī 米饭mǐfànwǒ bù chī mǐfàn.
I don’t eat rice.
 de 名字míngzi shì 李雷lǐléiwǒ de míngzi shì lǐléi.
My name is Li Lei.
 没有méiyǒu shuǐwǒ méiyǒu shuǐ.
I don’t have water.
   de 朋友péngyou zài 学校xuéxiàowǒ hé wǒ de péngyou zài xuéxiào.
My friend and I are at school.
今天jīntiān   学校xuéxiàojīntiān wǒ qù xuéxiào.
Today I am going to school.
  le 学校xuéxiào huí le jiāwǒ qù le xuéxiào,yě huí le jiā.
I went to school and also went back home.
 yǒu  běn shū běn shū shì  dewǒ yǒu yì běn shū,nà běn shū shì wǒ de.
I have a book; that book is mine.
  yào shuǐ yào  bēi cháwǒ bú yào shuǐ,wǒ yào yì bēi chá.
I don’t want water; I want a cup of tea.
今天jīntiān  hěn mángtài máng lejīntiān wǒ hěn máng,tài máng le.
I am very busy today; I am too busy.
明天míngtiān  huì zài jiāmíngtiān wǒ huì zài jiā.
Tomorrow I will be at home.
 kàn le  běn shūwǒ kàn le nà běn shū.
I read that book.
您好nínhǎo zài 公司gōngsī 工作gōngzuònínhǎo,wǒ zài gōngsī gōngzuò.
Hello, I work at the company.
 xiǎng shuō  hěn mángwǒ xiǎng shuō wǒ hěn máng.
I want to say I am very busy.
 已经yǐjīng huí jiā lewǒ yǐjīng huí jiā le.
I already went home.
 正在zhèngzài xiě  de 名字míngzitā zhèngzài xiě wǒ de míngzi.
He is writing my name.
因为yīnwèi  觉得juéde 今天jīntiān tài máng le, 所以suǒyǐ  没有méiyǒu  公司gōngsīyīnwèi wǒ juéde jīntiān tài máng le, suǒyǐ wǒ méiyǒu qù gōngsī.
Because I feel today is too busy, I didn’t go to the company.
 gēn  一起yìqǐ zài jiā kàn 电影diànyǐngwǒ gēn tā yìqǐ zài jiā kàn diànyǐng.
She and I are watching a movie at home.
 yǒu 电脑diànnǎowǒ yǒu diànnǎo.
I have a computer.
昨天zuótiān  gēn  shuō   néng zuótiān wǒ gēn tā shuō wǒ bù néng qù.
Yesterday I told her I couldn’t go.
 hái xiǎng tīng  shuō  de 名字míngziwǒ hái xiǎng tīng nǐ shuō nǐ de míngzi.
I still want to hear you say your name.
 mǎi le 手机shǒujī,   xiǎng mǎiwǒ mǎi le shǒujī, tā yě xiǎng mǎi.
I bought a phone; she also wants to buy one.
明天míngtiān  zài láimíngtiān wǒ zài lái.
I’ll come again tomorrow.
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.
 gèng 喜欢xǐhuan  cháwǒ gèng xǐhuan hē chá.
I prefer drinking tea.
  shū fàng zài 桌子zhuōzi 上面shàngmianwǒ bǎ shū fàng zài zhuōzi shàngmian.
I put the book on the table.
 xiān kāi dēng, zài kàn shūwǒ xiān kāi dēng, zài kàn shū.
I will turn on the light first, then read.
 zài 外面wàimiàn děng wǒ zài wàimiàn děng nǐ.
I am waiting for you outside.
 可能kěnéng 没有méiyǒu 时间shíjiān wǒ kěnéng méiyǒu shíjiān qù.
I might not have time to go.
 hái méi  guo 北京Běijīng,  xiǎng wǒ hái méi qù guo Běijīng, wǒ xiǎng qù.
I haven’t been to Beijing yet; I want to go.
  guo 上海Shànghǎi,  zài 北京Běijīng 工作gōngzuò guowǒ qù guo Shànghǎi, yě zài Běijīng gōngzuò guo.
I have been to Shanghai, and I have also worked in Beijing.
  dēng kāi le,  jiù kàn shūtā bǎ dēng kāi le, wǒ jiù kàn shū.
She turned on the light, and then I read.
  电脑diànnǎo fàng zài 桌子zhuōzi 上面shàngmian lewǒ bǎ diànnǎo fàng zài zhuōzi shàngmian le.
I put the computer on the table.
 xiān  一点儿yìdiǎnr shuǐ, zài  公司gōngsīwǒ xiān hē yìdiǎnr shuǐ, zài qù gōngsī.
I’ll drink a little water first, then go to the company.
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.
 máng,   huì lái 帮忙bāngmángwǒ máng, tā yě huì lái bāngmáng.
When I’m busy, he will also come to help.
  mén guān le,  zài 外面wàimiàn děng wǒ bǎ mén guān le, nǐ zài wàimiàn děng wǒ.
I closed the door; wait for me outside.
 xiǎng ràng  xiān huí jiāwǒ xiǎng ràng tā xiān huí jiā.
I want to let her go home first.
 ràng  zài 外面wàimiàn děng wǒ ràng tā zài wàimiàn děng wǒ.
I asked him to wait for me outside.
 需要xūyào huí , 然后ránhòu  电话diànhuà gěi  de 妈妈māmawǒ xūyào huí qù, ránhòu dǎ diànhuà gěi wǒ de māma.
I need to go back, then call my mom.
 常常chángcháng zài 早上zǎoshang chī 早饭zǎofàn, 晚上wǎnshang zài 饭店fàndiàn chī 晚饭wǎnfànwǒ chángcháng zài zǎoshang chī zǎofàn, wǎnshang zài fàndiàn chī wǎnfàn.
I often eat breakfast in the morning, and eat dinner at a restaurant in the evening.
 xiǎng  超市chāoshì 或者huòzhě zài jiā chī 晚饭wǎnfànwǒ xiǎng qù chāoshì huòzhě zài jiā chī wǎnfàn.
I want to go to the supermarket or eat dinner at home.
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.
 有时候yǒushíhou zài 公司gōngsī 旁边pángbiān děng , 然后ránhòu 一起yìqǐ  超市chāoshìwǒ yǒushíhou zài gōngsī pángbiān děng tā, ránhòu yìqǐ qù chāoshì.
Sometimes I wait for her near the company, then we go to the supermarket together.
早上zǎoshang  一边yìbiān  chá, 一边yìbiān kàn shūzǎoshang wǒ yìbiān hē chá, yìbiān kàn shū.
In the morning I drink tea while reading.
   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.
 需要xūyào zhǎo  de 同事tóngshì, 然后ránhòu 一起yìqǐ  超市chāoshìwǒ xūyào zhǎo wǒ de tóngshì, ránhòu yìqǐ qù chāoshì.
I need to look for my coworker, then go to the supermarket together.
 de 妈妈māma 常常chángcháng dài   超市chāoshìwǒ de māma chángcháng dài wǒ qù chāoshì.
My mom often takes me to the supermarket.
当然dāngrán 可以kěyǐ,  zài 外面wàimiàn děng  badāngrán kěyǐ, wǒ zài wàimiàn děng nǐ ba.
Of course; I’ll wait for you outside.
当然dāngrán,  现在xiànzài  电话diànhuà gěi , 或者huòzhě  lái 告诉gàosu , dōu 可以kěyǐdāngrán, nǐ xiànzài dǎ diànhuà gěi tā, huòzhě wǒ lái gàosu tā, dōu kěyǐ.
Of course. You can call her now, or I’ll go tell her; either is fine.
 为什么wèishénme hái méi lái?  需要xūyào zhǎo 。  děng le 多久duōjiǔtā wèishénme hái méi lái? wǒ xūyào zhǎo tā. nǐ děng le duōjiǔ?
Why hasn’t he come yet? I need to look for him. How long have you been waiting?
虽然suīrán 今天jīntiān  hěn máng, 但是dànshì 我们wǒmen 还是háishi  超市chāoshì basuīrán jīntiān wǒ hěn máng, dànshì wǒmen háishi qù chāoshì ba.
Although I’m busy today, let’s still go to the supermarket.
 应该yīnggāi huí jiā, 然后ránhòu zuò fàn gěi  chīwǒ yīnggāi huí jiā, ránhòu zuò fàn gěi tā chī.
I should go home, then cook for her.
 有时候yǒushíhou zài 超市chāoshì 旁边pángbiān zhǎo  de 同事tóngshìwǒ yǒushíhou zài chāoshì pángbiān zhǎo tā de tóngshì.
Sometimes I look for her coworker near the supermarket.
qǐng  dài   超市chāoshì, 然后ránhòu  qǐng  chī 晚饭wǎnfànqǐng nǐ dài wǒ qù chāoshì, ránhòu wǒ qǐng nǐ chī wǎnfàn.
Please take me to the supermarket, then I’ll treat you to dinner.
   每天měitiān 一边yìbiān 工作gōngzuò, 一边yìbiān  电话diànhuàtā hé wǒ měitiān yìbiān gōngzuò, yìbiān dǎ diànhuà.
She and I call on the phone while we work every day.
谢谢xièxie ,  一定yídìng qǐng  chī 晚饭wǎnfànxièxie nǐ, wǒ yídìng qǐng nǐ chī wǎnfàn.
Thank you; I will definitely treat you to dinner.
早上zǎoshang  zài jiā  cházǎoshang wǒ zài jiā hē chá.
In the morning I drink tea at home.
 xiǎng 认识rènshi wǒ xiǎng rènshi nǐ.
I want to get to know you.
 zài 外面wàimiàn děng le hěn jiǔwǒ zài wàimiàn děng le hěn jiǔ.
I waited outside for a long time.
 tài máng le,  还是háishi 明天míngtiān zài lái banǐ tài máng le, wǒ háishi míngtiān zài lái ba.
You’re too busy; I’d better come again tomorrow.
早上zǎoshang  起床qǐchuáng 以后yǐhòu  上班shàngbānzǎoshang wǒ qǐchuáng yǐhòu qù shàngbān.
In the morning I go to work after getting up.
 以前yǐqián  dǒng zhè  意思yìsiwǒ yǐqián bù dǒng zhè gè yìsi.
I didn’t understand this meaning before.
 现在xiànzài dǒng le,   dǒng letā xiànzài dǒng le, wǒ yě dǒng le.
Now she understands, and I understand too.
qǐng 慢慢mànmàn de shuō,  xiǎng tīng dǒngqǐng mànmàn de shuō, wǒ xiǎng tīng dǒng.
Please speak slowly; I want to understand.
 gāng 回来huílái,   gāng huí jiāwǒ gāng huílái, tā yě gāng huí jiā.
I just came back; she just went home.
 下班xiàbān 以后yǐhòu zǒu,  下午xiàwǔ zài  电话diànhuàwǒ xiàbān yǐhòu zǒu, nǐ xiàwǔ zài dǎ diànhuà.
I’ll leave after work; call again in the afternoon.
 zuì 喜欢xǐhuan kàn shū,  zuì 喜欢xǐhuan  chátā zuì xǐhuan kàn shū, wǒ zuì xǐhuan hē chá.
She likes reading the most; I like drinking tea the most.
今天jīntiān 中午zhōngwǔ 以后yǐhòu  cái yǒu 时间shíjiānjīntiān zhōngwǔ yǐhòu wǒ cái yǒu shíjiān.
I only have time after noon today.
 早上zǎoshang hěn zǎo 起床qǐchuáng, 中午zhōngwǔ 以后yǐhòu cái  cháwǒ zǎoshang hěn zǎo qǐchuáng, zhōngwǔ yǐhòu cái hē chá.
I get up very early in the morning; I only drink tea after noon.
  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?
 yòu lái  jiā le,  ràng  xiān 进来jìnláitā yòu lái wǒ jiā le, wǒ ràng tā xiān jìnlái.
He came to my place again; I asked him to come in first.
我们wǒmen 慢慢mànmàn de zǒu,  hái yào kàn 一下yíxiàwǒmen mànmàn de zǒu, wǒ hái yào kàn yíxià.
Let’s walk slowly; I still want to take a look.
 现在xiànzài yào 上班shàngbān le,  下午xiàwǔ zài láiwǒ xiànzài yào shàngbān le, nǐ xiàwǔ zài lái.
I need to go to work now; come again in the afternoon.
中午zhōngwǔ  yǒu 事情shìqíng, 以后yǐhòu  zài  电话diànhuà gěi zhōngwǔ wǒ yǒu shìqíng, yǐhòu wǒ zài dǎ diànhuà gěi nǐ.
I have things to do at noon; I’ll call you again later.
 huì xiě  de 名字míngzi manǐ huì xiě wǒ de míngzi ma?
Can you write my name?
 gāng gěi 妈妈māma  电话diànhuàwǒ gāng gěi māma dǎ diànhuà.
I just called my mom.
 现在xiànzài jiù wǒ xiànzài jiù qù.
I’ll go right now.
中午zhōngwǔ  一般yìbān zài 公司gōngsī chī 午饭wǔfànzhōngwǔ wǒ yìbān zài gōngsī chī wǔfàn.
At noon I usually eat lunch at the company.
 准备zhǔnbèi 明天míngtiān 早上zǎoshang zài  超市chāoshìwǒ zhǔnbèi míngtiān zǎoshang zài qù chāoshì.
I plan to go to the supermarket again tomorrow morning.
 gāng zài 外面wàimiàn 看见kànjiàn  lewǒ gāng zài wàimiàn kànjiàn tā le.
I just saw her outside.
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.
 xiān mǎi piào,  明天míngtiān 提前tíqián shí 分钟fēnzhōng dàonǐ xiān mǎi piào, wǒ míngtiān tíqián shí fēnzhōng dào.
Buy the tickets first; I will arrive ten minutes early tomorrow.
 zhàn zhe děng 公交车gōngjiāochē,  zuò zhe kàn shūtā zhàn zhe děng gōngjiāochē, wǒ zuò zhe kàn shū.
He is standing and waiting for the bus; I am sitting and reading.
 shì 去年qùnián lái 公司gōngsī 工作gōngzuò de,  shì 今年jīnnián lái detā shì qùnián lái gōngsī gōngzuò de, wǒ shì jīnnián lái de.
She came to the company to work last year; I came this year.
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.
 一般yìbān 下班xiàbān 以后yǐhòu zǒu huí jiāwǒ yìbān xiàbān yǐhòu zǒu huí jiā.
I usually walk home after work.
 zuò zhe děng wǒ zuò zhe děng tā.
I am sitting and waiting for her.
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