第一句：Please meet¹ at 11:00 by the gate².请于11点在大门口集合。

A:When and where should we meet?

我们在什么时间、什么地点集合呢？

B:Please meet at 11: 00 by the gate.

请于11点在大门口集合。

第二句：Please be back to the bus at 4 o'clock³.请与4点回到车上。

A:What time should we be back to the bus?

我们要在什么时候回到车上来？

B:Please be back to the bus at 4 o'clock.

请与4点回到车上。