Englishfor English speakers
outside
Preposition
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outdoors; not in a building; under the open sky
The plants are outside the house.
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.
castle
Noun
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A castle is a large, strong building used to protect the people inside.
In the Middle Ages, castles were used to protect the king and queen.
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In chess, the castle is another name for the rook.
castle
Verb
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In chess, to castle is to take a turn that involves both the rook and the king moving at once.
I was going to win if he hadn't decided to castle.