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.
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