The difference between That and Yon
When used as pronouns, that means the thing, person, idea, quality, event, action or time indicated or understood from context, especially if more remote geographically, temporally or mentally than one designated as "", or if expressing distinction, whereas yon means that one or those over there.
When used as adverbs, that means to a given extent or degree, whereas yon means yonder.
That is also determiner with the meaning: the (thing, person, idea, etc) indicated or understood from context, especially if more remote physically, temporally or mentally than one designated as "", or if expressing distinction.
That is also noun with the meaning: something being indicated that is there.
Yon is also adjective with the meaning: that (thing) over there.
check bellow for the other definitions of That and Yon
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That as a pronoun (demonstrative):
The thing, person, idea, quality, event, action or time indicated or understood from context, especially if more remote geographically, temporally or mentally than one designated as "", or if expressing distinction.
Examples:
"He went home, and after that I never saw him again."
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That as a pronoun:
The known (thing); .
Examples:
"They're getting divorced. What do you think about ''that''?"
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That as a pronoun (demonstrative):
The aforementioned quality; .
Examples:
"The water is so cold! — That it is."
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That as a pronoun (relative):
(plural that) Which, who; .
Examples:
"The CPR course that she took really came in handy."
"The house that he lived in was old and dilapidated."
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That as a pronoun (colloquial):
Examples:
"the place that [= where or to which] I went last year"
"the last time that [= when] I went to Europe"
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That as an adverb (degree):
To a given extent or degree.
Examples:
"The ribbon was that thin." "I disagree, I say it was not that thin, it was thicker... or maybe thinner..."
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That as an adverb (degree):
To a great extent or degree; very, particularly .
Examples:
"I'm just not that sick."
"I did the run last year, and it wasn't that difficult."
"synonyms: so"
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That as an adverb (obsolete, outside, dialects):
To such an extent; so. .
Examples:
"Ooh, I was that happy I nearly kissed her."
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That as a noun (philosophy):
Something being indicated that is there; one of those.
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Yon as an adjective (dated, or, dialectal):
That (thing) over there; of something distant, but within sight.
Examples:
"He went to climb yon hill."
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Yon as an adverb (dated, or, dialectal):
yonder.
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Yon as a pronoun (dated, or, dialectal):
That one or those over there.