4 sentences

1. 南方人习惯以大米为主食。

   nán​fāng​rén xí​guàn yǐ dà​mǐ wéi zhǔ​shí.

   Southerners are accustomed to having rice as their staple food.

   Source: Dong Chinese Dictionary

2. 他肯定是南方人。

   tā kěn​dìng shì nán​fāng​rén.

   He must be from the South.

   Source: Tatoeba

3. 我们不是南方人。

   wǒ​men bù shì nán​fāng​rén.

   We're not Southerners.

   Source: OpenSubtitles

4. 米饭是中国南方人的主食。

   mǐ​fàn shì Zhōng​guó nán​fāng​rén de zhǔ​shí.

   Rice is the staple food for people in southern China.

   Source: Dong Chinese Dictionary