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1·In addition to these arrangements, extra ambulances will be on duty until midnight.

除了这些安排以外，另增救护车值班至午夜。《牛津词典》

2·Shouldn't you be on duty in Room Four?

你不是应该在4号房值班吗？

3·Now comes your turn to be on duty.

现在轮到你值日了。

4·I'll be on duty tonight.

今天晚上是我的班儿。

5·No matter who must be on duty on time.

不管是谁都要按时上班。

6·It's time for you to be on duty today.

今天该你值日了。到我们出发的时候了。

7·Really? Well, I will be on duty next Monday.

真的吗？那好，下周一我去报到。

8·Experienced banquet waiters must also be on duty.

还必须让有经验的宴会服务员当班。

9·Amanda: Really? Well, I will be on duty next Monday.

阿曼达：真的吗？那，我下周就去报到。

10·The rule is that someone must be on duty at all times.

按照规定，任何时候均需有人值班。