health foods为什么要+s,而healthy food为什么不加s,那么junk food 加s的方式一步一样呢同上,还有,为什有很多种食物时food也不加s,那它要什么时候才加s.英语老师答更好

health foods为什么要+s,而healthy food为什么不加s,那么junk food 加s的方式一步一样呢同上,还有,为什有很多种食物时food也不加s,那它要什么时候才加s.英语老师答更好 百事食品(中国)有限公司 PepsiCo Foods (China) Co.,Ltd的foods为什么要加s? yang foods为什么要加s如题You should eat hot yang foods,like beef为什么要加s You should eat fruit and other healthy foods.为什么此处用foods而不用food? healthy foods 和 junk food 的区别我的书上写着“junk food”,这里的food是不可数名词,为什么“healthy foods ”要加s? 下列句中为什么要填写keep health?It's easy to keep health . 一个英语语法问题.为什么need和contain后面要加S?而有些不用呢?Evry person (needs) water and a diet of healthy foods.These foods should (contain) some fat,some fibre,a little salt and so on.It (contains) a lot of fruit and green veg food和foods的区别I love junk food too.为什么不加sother healthy foods.为什么加s We need lots of ___A.health food B.health foods C.healthy foods D.healthy food we eat ____ every day.a.health food b.healthy food c.health foods d.healthy foodswe eat ____ every day.a.health food b.healthy food c.health foods d.healthy foodsall of us find ____ necessary to take excise every day.a.this b.that c.it d.themwho's th 英语语法结构分析卷纸上阅读理解上有这么一句“all foods including water ,potatoes and vegetables contains 70% water.”,为什么contain 要加s,all foods表示的难道不是复数吗 The foods you eat could help with this problem.food为什么加S? All of these birthday foods may be different中food为什么加s It‘s bad for your health to drink too much.为什么要用to it's good for our health to eat fruit为什么要加to There are lots of different food here.为什么用food而did you know that some fDid you know that some foods might cause cancer?中用foods he can eat some foods 为什么can不加s不是第三人称单数加动词加s吗为什么说清楚我要知道为什么情态动词后不加s说清楚 为什么so healthy foods 不对 such healthy foods对