1.ask for leave：
ask for a sick leave of three days请三天
病假2.
take off：
这星期五我可以请假吗?Can I take this Friday off?
如果是
名词短语的话 ，用法例如
请假半天A half-day leave ; Half-day leave of absence
望采纳~
追问我想在2月11号请一天假，请问这句应该怎么说
追答l want to ask for leave on February 11
l want to ask a day leave/have a day off on February 11
还有问题吗？满意的话望采纳~