Englishfor English speakers
who
Pronoun
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You use who to add a clause to explain more about the person or people you're talking about.
They are good people who are working hard.
We saw Kim, who was in his car.
We asked everybody who was there.
It was you who lost the keys, not me.
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You use who to ask about a person or people.
Who was on the phone?
Whos your new teacher?
Who did you meet today?
He told me who was there.
I'll ask who can help us.
closed
Adjective
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Not open.
The store is closed on the weekends.
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Not available to the public.
I used a closed source to write the article.
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.