一瓶水要多少钱 yi ping shui yao duo shao qian

一 瓶 水 （要） 多 少 钱 ? Yī píng shuǐ （yào） duō shǎo qián ? “一”， followed by a second tone 瓶， becomes fourth tone in real conversation， hence “ yì”, although many people would not bother to alter the tone when writing it in PINYIN.

一 瓶 水 要 多 少 钱 yī píng shuǐ yào duō shǎo qián