The difference between Certain and Some
When used as determiners, certain means having been determined but not specified, whereas some means a certain proportion of, at least one.
When used as pronouns, certain means unnamed or undescribed members (of), whereas some means a certain number, at least one.
Certain is also noun with the meaning: something certain.
Certain is also adjective with the meaning: sure, positive, not doubting.
Some is also adverb with the meaning: of a measurement: approximately, roughly.
check bellow for the other definitions of Certain and Some
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Certain as an adjective:
Sure, positive, not doubting.
Examples:
"I was certain of my decision."
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Certain as an adjective (obsolete):
Determined; resolved.
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Certain as an adjective:
Not to be doubted or denied; established as a fact.
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Certain as an adjective:
Actually existing; sure to happen; inevitable.
Examples:
"Bankruptcy is the certain outcome of your constant gambling and lending."
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Certain as an adjective:
Unfailing; infallible.
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Certain as an adjective:
Fixed or stated; regular; determinate.
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Certain as an adjective:
Not specifically named; indeterminate; indefinite; one or some; sometimes used independently as a noun, and meaning certain persons; see also "one".
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Certain as a pronoun (with ''of''):
Unnamed or undescribed members (of).
Examples:
"There where serious objections to certain of the proposals."
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Certain as a noun (with "the"):
Something certain.
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Some as a pronoun:
A certain number, at least one.
Examples:
"'Some enjoy spicy food, others prefer it milder."
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Some as a pronoun:
An indefinite quantity.
Examples:
"Can I have some of them?"
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Some as a pronoun:
An indefinite amount, a part.
Examples:
"please give me some of the cake; everyone is wrong some of the time"
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Some as an adverb:
Of a measurement: approximately, roughly
Examples:
"I guess he must have weighed some 90 kilos."
"'Some 30,000 spectators witnessed the feat."
"'Some 4,000 acres of land were flooded."