形容人跑得快的英语句子可以通过以下方式表达：

基本句型

- He/She runs very fast.

- The runner runs at a swift pace.

使用比喻

- He runs as fast as a cheetah.

- She's as fast as lightning.

比较结构

- Jack runs faster than Tom.

- Bob runs the fastest among us.

副词强调

- The sprinter runs incredibly fast.

- She runs extremely fast.

短语表达

- He's on the fast track.

- She's a speed demon.

注意：

动词需根据主语数选择第三人称单数形式（如runs）；

若强调速度，可用副词如"swiftly"、"speedily"修饰动词；

比喻时需注意主谓一致（如"cheetah"为单数）。