Englishfor English speakers
the
Determiner
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Used, instead of a, to reference something specific, already known to exist.
Compare "I read a book." and "I read the book."
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Used with a stress, to show that the word following is special.
Are you the John Smith that I went to school with?
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Used with an adjective that acts like a noun to mean all of the people concerned
The poor are always with us.
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Used with superlatives forms of adjectives and adverbs.
You are the best.
door
Noun
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A piece of a wall that can be opened (leaving a hole in the wall to walk through) or closed (covering the hole). Some doors are on hinges; others slide.
Please open the door for him. His hands are full.
is
Verb
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A form of the verb be when talking about someone or something else.
He is late for class.
Is it hot in here?
unlocked
Adjective
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Not locked