写读书笔记用英语叫做 "taking notes while reading a book" 或 "making reading notes".
"Taking notes" 是在做笔记的意思，而 "while reading" 则是表示在阅读的过程中做笔记。
例句：
It's important to take notes while reading, so you can remember key points later.
(在阅读过程中做笔记很重要，这样你就能稍后记住关键点。)
Making reading notes helped me to better understand the book.
(做读书笔记帮助我更好地理解这本书。)