4 sentences

1. 辛是天干的第八位。

   xīn shì tiān​gān de dì​bā wèi.

   Xin is the eighth of the ten Heavenly Stems.

   Source: Dong Chinese Dictionary

2. 其实，他是第八位。

   qí​shí, tā shì dì​bā wèi.

   Actually, he's eighth.

   Source: OpenSubtitles

3. 今天是第八天了。

   jīn​tiān shì dì​bā tiān le.

   Today is the eighth day.

   Source: OpenSubtitles

4. 这是我们班第八个出场的同学。

   zhè shì wǒ​men bān dì​bā gè chū​chǎng de tóng​xué.

   This is the eighth student from our class to perform.

   Source: Dong Chinese Dictionary