Englishfor English speakers
idea
Noun
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An idea is a concept or a thought.
It was a good idea.
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An idea is something abstract (not concrete).
Love is just an idea.
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An idea is a way to see something, a view.
He changed her ideas on religion.
that
Determiner
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Used to show which thing we are talking about; used with things that are not close to the speaker.
Give me that book, not this one.
Give me that, not this.
That dog is hungry.
that
Subordinator
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used to link a subordinate clause to a main one
You said that you liked me.
Give me the book that I dropped.