your body needs about two liters of water 原谅我 我不懂 为什么need加s?

your body needs about 2.4 litres of water___(day) plants need water为什么加s He says he needs a book.say已经加s了,为什么need还要加s? she needs study .need加S吗? Who needs a cup of tea?中need为啥加s the boy needs ball pen为什么need要加s呢? The school needs help to teach music need为什么加s. 原谅我不懂爱英语怎么说 a body of water that joins two larger bodies of water.是一个词的解 I don't think he needs help 问一下need为什么加s don't后不是加原形吗? My car needs repairing为什么needs要加s? About 70% of the human body is water.Water _____ ______about