I have been on sick leave for seven months with depression.

我因患抑郁症已休了7个月的病假。

There are no paid holidays or sick leave if you are self-employed.

如果你是个体经营的，那就没有带薪休假或病假了。

Smoking people love sick leave.

吸烟人爱请病假。

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。

May I ask for a sick leave?

我可以请病假吗？