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1·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。《柯林斯英汉双解大词典》

2·Mary is on sick leave now.

玛丽目前正请病假中。

3·She's on sick leave today.

她今天请病假。

4·He's on sick leave today.

她今天请病假。

5·I'm on sick leave.

我请了病假。

6·Tom isn't at work because he's on sick leave.

汤姆没上班，因为他请病假。

7·Except on sick leave I was never absent class.

除病假外，我永不缺课。

8·Except on sick leave I was never absent from class.

除病假外，我永不旷课。

9·Except on sick leave, I was never absent from class.

除病假外，我永不缺课。

10·You will be paid while you are on sick leave but obviously there are limits to this.

休病假时你是有工资收入的，但是很明显，这是有限制的。