2 sentences

1. 我是她们的班主任。

   wǒ shì tā​men de bān​zhǔ​rèn.

   I'm their homeroom teacher.

   Source: OpenSubtitles

2. 我是他的班主任。

   wǒ shì tā de bān​zhǔ​rèn.

   I am his homeroom teacher.

   Source: OpenSubtitles