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My Japanese coworker has been unable to explain clearly this. I know that the
difference comes up naturally but as someone learning Japanese I need a few
examples and grammar rules to know which one to use.

Could you help me understand when to use each of them concretely?
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2014-09-30T00:45:48.833
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2014-09-30T05:18:04.927
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question
grammar translation
Difference between 「なるベく」 and 「なるべき」
「なるベく」 should be considered a single word meaning you want to do something or
want something done "as [...] as possible". For example,
「お問い合わせはなるべく短めにお願いします。」 would mean "Please keep any inquiries as short as
possible.".

The 「～べき」 suffix gets attached to verbs and means "should", so 「なるべき」 means
"should become". For example,「なるべきようになった。」 means "It is as it should be."

So basically,「なるベく」 is used when expressing intent (when the subject is the
1st person) or making a request (when the subject is not the 1st person),
whereas 「なるべき」 is used intransitively as a qualification of how things are or
are supposed to be.
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2014-09-30T02:52:24.433
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2014-09-30T02:59:03.250
2014-09-30T02:59:03.250
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answer
なるべく is an adverb and the meaning is "as～as possible".

なるべき is made up from a verb なる and a Japanese old auxiliary べし. The meaning of
べし is 「～して当然だ。するのがよい。」 and so on. べき is a conjugation change of べし.

For example, 明日はなるべく早く起きよう。( I will wake up as early as possible tomorrow).

あなたは英語の先生になるべきだ。(You should/have to be an English teacher).
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2014-09-30T04:23:10.983
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2014-09-30T05:18:04.927
2014-09-30T05:18:04.927
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answer