English question

其實有好多講法,睇下你想點講!
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有禮貌
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I would like to go to the bathroom.(美國人叫廁所或者洗手間做bathroom,當然唔想話比你知大便定小便,其他人都唔想知!)
英國人就講, I would like to go to the toilet!!
唔禮貌
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I am going to pee.--我去交水費!
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I am going to take a crack(or shxt)!--我去爆石!
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I hope this can help you!

I would like to use the restroom/bathroom/toilet.

高雅一D: I would like to use the lavatory.

Formal 場合, 可以就咁講: May I be excused.

2008-08-13 16:33:02 補充：
Using "would like to use" is more polite than simply stating that you "want", you "need" or "want to go".

Formal 場合, 可以就咁講: May I be excused. (So that you don't have to state your purpose of leaving the venue. To avoid embarrassment.)

小孩通常講:
1. 我想去小便? I want to go to pee pee.

2. 我想去大便? I want to go to poo poo.
大人就唔會講去厠所做乜啦! 因為會好不雅架! 除非係屋企人啦! 多數人只會講以下:
I want to go to restroom.
I need to go to restroom

I want to go toilet