请假的英文为ask for a leave或者ask for a day off。
以下例句帮助更好地理解：
I have to ask for a leave tomorrow morning.
我明天上午得请假了。
Everyone enjoys the class so much that they feel it's a pity to ask for a leave if
emergency occurs.
大家对学习英语都非常喜爱，所以有时学员因特殊情况请假不能参加，都会觉得很遗憾。
