4 sentences

1. 记下那辆车的车牌号码。

   jì​xià nà liàng chē de chē​pái hào​mǎ.

   Get that car's license plate number.

   Source: OpenSubtitles

2. 我会记下你的态度。

   wǒ huì jì​xià nǐ de tài​du.

   I shall make a note of your attitude.

   Source: OpenSubtitles

3. 他在本子上记下了老师讲的重点。

   tā zài běn​zi shàng jì​xià le lǎo​shī jiǎng de zhòng​diǎn.

   He noted the teacher's key points in his notebook.

   Source: Dong Chinese Dictionary

4. 我在笔记本上记下了老师说的话。

   wǒ zài bǐ​jì​běn shàng jì​xià le lǎo​shī shuō de huà.

   I wrote down what the teacher said in my notebook.

   Source: Dong Chinese Dictionary