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.
princess
Noun
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A princess is the daughter of the king and queen of a country, and sister of the prince. The princess can also be the wife of a prince.
of
Preposition
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Made using.
It is a house of cards.
Mars
Proper noun
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Mars is known as the red planet in our solar system.
Mars is a very red planet.
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In Roman mythology, Mars is the god of war. He is known as Ares in Greek mythology.