4 sentences

1. 今天下午有一节体育课。

   jīn​tiān xià​wǔ yǒu yī jié tǐ​yù​kè.

   There is a PE class this afternoon.

   Source: Dong Chinese Dictionary

2. 我当时在上体育课。

   wǒ dāng​shí zài shàng tǐ​yù​kè.

   I was in gym class.

   Source: OpenSubtitles

3. 他在体育课上练习跳山羊。

   tā zài tǐ​yù​kè shàng liàn​xí tiào shān​yáng.

   He practiced vaulting in PE class.

   Source: Dong Chinese Dictionary

4. 学生们正在操场上上体育课。

   xué​sheng men zhèng​zài cāo​chǎng shàng shàng tǐ​yù​kè.

   The students are having a PE class on the playground.

   Source: Dong Chinese Dictionary