坐下在英语中可以表示为“sit down”，这是一个常用的动词短语。下面是一个关于坐下的英语写作范例：

As soon as I entered the classroom, I found my seat and sat down. The teacher hadn't arrived yet, so I took out my notebook and started reviewing my notes from the previous lesson. The room was quiet, except for the sound of students shuffling in their seats and the occasional whisper.

After a few minutes, the teacher walked in and greeted us with a smile. She instructed us to take out our textbooks and turn to page 47. I quickly flipped through the book and found the page, then sat back in my seat and prepared to learn.

Throughout the lesson, I sat attentively and took notes on the important points the teacher emphasized. Occasionally, I would shift in my seat to get more comfortable, but I tried not to make any distracting noises. When the bell rang signaling the end of class, I gathered my things and stood up, feeling satisfied with the knowledge I had gained during the lesson.