grammarmedium
Not this
He eats all grain for breakfast.
Use this
He eats all grains for breakfast.
All grains 是复数形式，指各类谷物；all grain 通常指谷物材料，不是种类。应用复数形式。
五谷；所有谷物
先理解核心含义，再看它在真实句子里的用法。
五谷；所有谷物
all the different kinds of cereal crops; the five staple grains
All grains contain carbohydrates, so they give you energy for the day.
所有谷物都含有碳水化合物，因此能为你的身体提供一天的能量。
Try all grains in your meals, from rice to quinoa, for more variety.
在膳食中尝试所有谷物，从大米到藜麦，让饮食更多样化。
He avoids all grains on his doctor's advice, but he still feels tired.
他听从医生的建议避免了所有谷物，但仍然感到疲倦。
Not this
He eats all grain for breakfast.
Use this
He eats all grains for breakfast.
All grains 是复数形式，指各类谷物；all grain 通常指谷物材料，不是种类。应用复数形式。
Not this
I prefer all grains bread.
Use this
I prefer whole grain bread.
All grains 不能直接用作形容词修饰名词；表达“全谷物”应用 whole grain 或 whole grains。
Not this
All grains is good for you.
Use this
All grains are good for you.
主语 all grains 是复数，谓语动词应用复数形式 are。
Choose the next layer that will help you use all grains with more confidence.
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use all grains naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
作主语时，谓语动词通常用复数。
Dictionary facts from BridgeDict normalized sources.