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Grammar detail: ねばならない

ねばならない - have to do, feel obliged to do
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verb negative stem
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ねばならない
or the politer form
ねばなりません
means 'have to do (something)' in the sense of 'feeling obliged' to do it.
なん
としても
せんそう
戦争
ふせ
がねばならない

We must prevent war at any cost.
きみ
もう
せいじん
成人
たっ
した
からには
じぶん
自分
こうどう
行動
せきにん
責任
たねばならない

Now that you have come of age, you should be responsible for what you do.
きみ
いつも
せいけつ
清潔
しておかねばなりません
You must always keep your hands clean.
This form occasionally uses the ぬ negative - classical negative form form:
みょうごにち
明後日
までこの
しごと
仕事
やってしまわねばならぬ
I must get my work done by the day after tomorrow.
Note that the ねばならない form of する verbs is irregular - する becomes せねばならない:
ぜひ
是非
とも
もくひょう
目標
たっせい
達成
せねばならない

I have to attain my purpose at all costs.
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Kanji used in this grammar

カ   なに    なん what?   
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セン   いくさ battle, war   たたか to do battle   
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ソウ   あらそ to contend, to compete, to contest; to argue, to dispute   
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ボウ   ふせ to protect, to defend (against)   
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クン   きみ you   
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セイ   ジョウ   な to become   な to perform, to accomplish   
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ジン   ニン   ひと person   
タツ    arrive   
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ジ   シ   みずか self   
ブン   ブ   フン   わける to divide, to distinguish   わかる to understand   わかれる to be divided   わかつ to share, distribute   
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コウ   ギョウ   アン   ゆ    い to go   おこな to take place   
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ドウ   うご to move, to stir   うごかす to shift, to move   
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セキ   せめる to torture; to blame, accuse   
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ニン    responsibility   まか    まかせる to entrust (to)   
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ジ   も to hold, to have   
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シュ   hand   て    た-    
セイ   ショウ   きよ clean, clear   きよめる purify   きよまる be purified   
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ケツ   いさぎよ gallant, manly; upright; undefiled, clean   
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メイ   ミョウ   あかり light   あかるい bright   あかるむ to brighten   あからむ to become luminous (at dawn)   あきらか obvious   あかす to lay bare   あ to open   あける to empty   
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ゴ   コウ   のち    あと afterwards   うし behind   おくれる be late   
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ニチ   ジツ   sun; day   ひ    -か    
シ   ジ   つかえる to attend to   
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ジ   ズ   こと thing; matter   
ゼ    just so, correctness, justice, right   
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ヒ   mistake
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ボク   モク   eye   ま-    め    
ヒョウ    sign, mark   
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