请给我一杯水好吗？

Can I have a glass of water, please?

服务员，请给我一杯水。

Waiter, please bring me a glass of water.

请给我一杯水。

Please give me a glass of water.

请给我一杯水，

Give me a glass of water, if you please.

请给我一杯水好吗？

Could I have a glass of water, please?

请给我一杯水（一个调羹、一个茶匙、一把餐刀）。

Please bring me a glass of water(a spoon, a teaspoon, a knife).

请给我一杯水 ( 一个调羹 、 一个茶匙 、 一把餐刀 ).

Please bring me a glass of water ( a spoon, a teaspoon, a knife ).