English: Are you a doctor? (formal)

Pinyin: Nín shì yīshēng ma?

English: Are you a teacher? (formal)

Pinyin: Nín shí lǎoshī ma?

English: Are you tourists?

Pinyin: Nǐ men, shì yóukè ma?

English:  May I ask how old you are?

Pinyin: Qǐngwèn, ní jǐ suì?

English:  May I ask your name? (formal)

Pinyin: Qǐngwèn nín guìxìng?

English:  He is a doctor. 

Pinyin: Tā shì  yīshēng.

English:  He is a lawyer. 

Pinyin: Tā shì lǜshī.

English:  Miss Wang is a nurse.

Pinyin: Wàng xiǎojie, shì hùshi.

English:  Mr. Wang is a taxi driver.

Pinyin: Wàng xiānsheng shì, chūzūchē sījī.

English: I am a tourist.

Pinyin: Wǒ shì yóukè.

English:  I am Chinese

Pinyin: Wǒ shì Zhōngguórén.

English:  I am also Chinese

Pinyin: Wǒ yě shì Zhōngguórén.

English:  I am not Chinese either.

Pinyin: Wǒ yě bù shì Zhōngguórén.

English:  I am eighteen years old.

Pinyin: Wǒ shí bā suì.

English:  I am not a teacher.

Pinyin: Wǒ bù shì lǎoshī.

English:  I am very well.

Pinyin: Wǒ hěn hǎo.

English: My last name is Huang.

Pinyin:  Wǒ xìng Huáng.

English: My name is Huáng Xìn (I am called...).

Pinyin:  Wǒ jiào Huáng Xìn.

English:  eleven

Pinyin: shí yī

English: twelve

Pinyin: shí èr

English: thirteen

Pinyin: shí sān

English: fourteen

Pinyin: shí sì

English: fifteen

Pinyin: shí wǔ

English: sixteen

Pinyin: shí liù

English: seventeen

Pinyin: shí qī

English: eighteen

Pinyin: shí bā

English: nineteen

Pinyin: shí jiǔ

English: twenty

Pinyin: èr shí