YOU SAID:
can i have a cup of water?
INTO JAPANESE
私は一杯の水を飲むことができますか?
BACK INTO ENGLISH
Can I drink a glass of water?
INTO JAPANESE
水を一杯飲んできなさい
BACK INTO ENGLISH
Drink a glass of water.
INTO JAPANESE
水を一杯飲んできなさい
BACK INTO ENGLISH
Drink a glass of water.
That didn't even make that much sense in English.