a glass of和a cup of的区别：含义不同、用法不同、强调重点不同。a glass of意为“一玻璃杯的”，是指长形状的玻璃杯子，一般没有把手，用来喝酒和果汁等；a cup of意为“一杯的量”，是指小型的、有把手的杯子，通常是做茶杯，咖啡杯来用的，还可以用做比赛用的金杯、银杯。

a glass of指长形状的玻璃杯子，这种杯子没有把手，用来喝酒和果汁等，一般接冷饮。

例句：She stood up suddenly, upsetting a glass of wine.

她蓦然起身，碰倒了一杯酒。

He'd knocked over a glass of water.

他打翻了一杯水。

I'm dying for a glass of water.

我真想喝杯水。

They drank a glass of wine to seal their new friendship.

他们干了一杯，交成朋友。

He drank a glass of whisky, then another and then another.

他喝了杯威士忌，接着又喝了一杯，然后又喝了一杯。

If you wish, you may now have a glass of milk

你想喝的话，现在可以喝一杯牛奶。

He asked for a glass of port after dinner.

晚饭后，他要了一杯波尔图葡萄酒。

He's quaffed many a glass of champagne in his time.

他年轻时曾经开怀畅饮过不少香槟美酒。

My favourite tipple is a glass of port.

我最喜欢喝的酒是波尔图葡萄酒。

Give him a glass of water with a dash of whisky in it.

给他一杯水，加少许威士忌。

If you feel like snacks, drink a glass of water first.

如果你想吃零食,先喝杯水。

The outside of a glass of ice water sweats on a hot day.

热天冰水玻璃杯的外面冒出水气。

a cup of指小型的，有把手，通常和杯垫一起的杯子，通常是做茶杯，咖啡杯来用的，一般接热饮。

例句：A cup of tea? There's nothing I'd like better!

一杯茶？那最好不过了！

Would you like a cup of tea?

你想喝杯茶吗？

Breakfast consisted of dry bread and a cup of tea.

早餐有无黄油的面包和一杯茶。

Have a cup of tea ─ unless you'd prefer a cold drink?

喝杯茶吧——除非你喜欢冷饮？

A cup of coffee finished the meal perfectly.

饭后一杯咖啡，美餐圆满结束。

She poured out her troubles to me over a cup of coffee.

她一面喝着咖啡，一面向我倾吐着她的烦恼。

She put a cup of tea down on the bedside table

她在床头柜上放了一杯茶。