Englishfor English speakers
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.
heart
Noun
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The part of the body that pumps blood.
He has a problem with his heart.
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(symbolic) Where emotions are.
You broke my heart.
—
Center, core.
We get to the heart of the problem.
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for others, compassion.
He has a lot of heart.
of
Preposition
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Made using.
It is a house of cards.
stone
Noun
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A stone is a hard, solid piece of earth.
I do not have a hammer but I will use a stone to hammer the nail.