我想要喝水
I want to drink some water.
want（想）---也可以＝would like to(比较客气的语气)
I'd like some water就是我想喝水的意思。不要把汉语的思维带进来。
May I have some water?
Would you please give me some water?
以上是在外作客或者公共场合向别人索取水的说法,比较正式.
I want some water.
即是很直白的回答,一般用前两种.
i want some water.
i want to drink some water
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