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1·So I ask leave from you, I can't attend the Sunday's activity.

所以向你请假，不参加周日上午…的答案，请您帮助这些有需要的人，迁安…

2·I will ask leave to call on you on Monday if you can spare me the time.

如果您能饶恕我时间，在星期一我在您将请求事假叫。

3·When the guests are to leave, the host may still politely ask them to stay.

当客人要离开时，主人仍然可以礼貌地请他们留下。

4·Did she ask for leave?

她请假了吗？

5·Jack didn't come to school yesterday, nor did he call the teacher to ask for leave.

杰克昨天没有上学，也没有打电话向老师请假。

6·Students need to ask for a leave ahead of time if they can't go to school for several days.

如果学生几天不能来上课，他们需要提前请假。

7·I'm writing this e-mail to ask for a sick leave because I have a fever.

我写这封邮件是为了请假，因为我发烧了。

8·We had to ask him to leave.

我们不得不让他离开。《柯林斯英汉双解大词典》

9·I'm writing this e-mail to ask for sick-leave because I'm not feeling myself today.

写这封邮件是为了请病假，因为我今天感觉有点不舒服。

10·If you want to ask for sick leave, you must get your teacher's agreement.

如果你想请病假，必须得到老师的同意。