我想喝水。
Wǒ xiǎng hē shuǐ.
I want to drink water.
水开了。
Shuǐ kāi le.
The water has boiled.
他姓水。
Tā xìng Shuǐ.
His surname is Shui.
水先生来了。
Shuǐ xiānsheng lái le.
Mr. Shui has arrived.
