如果一个人很渴，他可能会说：

"I'm really thirsty."

"I could really use some water right now."

"I could go for a drink of water."

"My mouth is so dry, I could really use some water."

"I could use a glass of water to quench my thirst."

你也可以用其他短语来表达你很渴，例如：

"I'm parched." (这个短语意思是“极渴的”。)

"I'm dying of thirst." (这个短语意思是“渴得要死”。)

"I'm dehydrated." (这个短语意思是“脱水的”，通常用来描述身体缺少足够的水分。)