在英语中，"我先休息几天"可以用以下几种表达方式来表达：
"I'll take a few days off."
这是一种常用的表达方式，"take a few days off"是一个习惯用语，意思是"休息几天"。
"I'll have a few days rest."
这是另一种常用的表达方式，"have a few days rest"意思也是"休息几天"。
"I'm going to take some time off."
这是另一种常用的表达方式，"take some time off"意思是"休息一段时间"。
以下是一些英文例句及其中文翻译：
"I'm exhausted. I think I'll take a few days off to rest."
"我很累了。我想我会休息几天来休息一下。"
"I've been working non-stop for weeks. I'm going to take some time off to recharge."
"我已经连续工作了几个星期。我要休息一段时间来恢复一下。"
"I'm really burnt out. I think I'll have a few days rest to relax and clear my mind."
"我真的很疲惫。我想我会休息几天来放松一下，清除一下思绪。"