6 sentences

1. 他的那一记发球不幸落网了。

   tā de nà yī jì fā​qiú bù​xìng luò​wǎng le.

   Unfortunately, his serve hit the net.

   Source: Dong Chinese Dictionary

2. 轮到他发球了。

   lún​dào tā fā​qiú le.

   It's his turn to serve.

   Source: Dong Chinese Dictionary

3. 排球运动员正在练习上手发球。

   pái​qiú yùn​dòng​yuán zhèng​zài liàn​xí shàng​shǒu fā​qiú.

   The volleyball players are practicing overhand serves.

   Source: Dong Chinese Dictionary

4. 教练向队员们表演了如何正确发球。

   jiào​liàn xiàng duì​yuán men biǎo​yǎn le rú​hé zhèng​què fā​qiú.

   The coach demonstrated to the team members how to serve correctly.

   Source: Dong Chinese Dictionary

5. 他在决胜盘中出现了一个关键的发球失误。

   tā zài jué​shèng​pán zhōng chū​xiàn le yī gè guān​jiàn de fā​qiú shī​wù.

   He made a crucial service error in the deciding set.

   Source: Dong Chinese Dictionary

6. 高尔夫运动员在第一个发球台准备发球。

   gāo'ěr​fū yùn​dòng​yuán zài dì​yī gè fā​qiú​tái zhǔn​bèi fā​qiú.

   The golfer is preparing to tee off at the first tee.

   Source: Dong Chinese Dictionary