Englishfor English speakers
protein
Noun
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Protein is a natural substances in food such as meat, milk, and beans.
Dr. Lecter told me that if I ate more protein, it would help me get bigger and stronger.
He told me that foods like milk, eggs, fish, and beans have a lot of protein in them.
a
Determinative
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A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
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A is the first letter of the alphabet.
The letter "a" comes before "b".
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In some schools, an A is a very high grade.
Ron got an A on his earth science test.