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Grammar detail: べき

べき - should; ought to
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verb plain form
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べき(だ)
means
should ~; ought to ~
べき expresses the idea that in the speaker's judgment, the subject ought to do something. It is not as strong as 'must do' forms such as なければならない, but it is stronger than 'suggestion' forms such as
ほう
がいい.
べき is an 'auxiliary', meaning it is placed after the verb that it modifies.
わか
とき
たくさん
ほん
べき
One should read a lot of books when one is young.
その
おとこ
ちしき
知識
いずみ
いうべき
ひと
だった
The man was a fountain of knowledge.
にく
べる
まえ
こま
かく
べきです
You should cut up your meat before you eat it.
When べき follows the verb する, it can optionally be shortened to すべき with no change in meaning:
りた
もの
なくさないようすべきです
You should not lose anything borrowed.
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Kanji used in this grammar

ホウ   かた way, direction   
ジャク   ニャク   わか young   もしくは or   
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ジ   とき time, occasion   
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ホン   book   もと origin   
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ドク   トク   トウ   よ to read   
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ダン   ナン   おとこ male, man   
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チ   し to know   
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シキ    knowledge, discrimination   
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セン   いずみ spring   
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ジン   ニン   ひと person   
ニク   meat
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ショク   ジキ    food   たべる to eat   く to eat   
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ゼン   まえ before   
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サイ   ほそ thin   ほそ to get thin, taper off   こま    こまかい detailed, fine   
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セツ   サイ   き to cut   きれる to break, to snap   
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シャク   かりる to borrow   
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ブツ   モツ   もの thing   
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