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.
theory
Noun
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A theory is an idea that tries to explain an observation.
The new information showed that his theory about growth was incorrect.
Nobody has disproved Einstein's theory of general relativity.
of
Preposition
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Made using.
It is a house of cards.
justice
Noun
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Justice is the morally fair and right state of everything. To have justice as a person's character trait means that they are just and treat everyone the same, or how they would like to be treated.
Making fun of someone or not letting them do something others can do because of the way someone looks, where they come from, their religion, or other things that are not wrong and a part of a person naturally or by birth is not just.