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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
66 words
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verb negative stem
+
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.
This is a formal structure. It is not commonly encountered in conversational Japanese.
なん
何
としても
せんそう
戦争
は
ふせ
防
がねばならない
。
We must prevent war at any cost.
きみ
君
はもう
せいじん
成人
に
たっ
達
した
からには、
じぶん
自分
の
こうどう
行動
に
せきにん
責任
を
も
持
たねばならない
。
Now that you have come of age, you should be responsible for what you do.
きみ
君
は、いつも
て
手
を
せいけつ
清潔
に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
までにこの
しごと
仕事
を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
を
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

何
カ   なに    なん what?   
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戦
セン   いくさ battle, war   たたかう to do battle   
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争
ソウ   あらそう to contend, to compete, to contest; to argue, to dispute   
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防
ボウ   ふせぐ to protect, to defend (against)   
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君
クン   きみ you   
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成
セイ   ジョウ   なる to become   なす to perform, to accomplish   
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人
ジン   ニン   ひと person   
達
タツ    arrive   
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自
ジ   シ   みずから self   
分
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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行
コウ   ギョウ   アン   ゆく    いく to go   おこなう to take place   
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動
ドウ   うごく to move, to stir   うごかす to shift, to move   
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責
セキ   せめる to torture; to blame, accuse   
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任
ニン    responsibility   まかす    まかせる to entrust (to)   
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持
ジ   もつ to hold, to have   
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手
シュ   hand   て    た-    
清
セイ   ショウ   きよい clean, clear   きよめる purify   きよまる be purified   
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潔
ケツ   いさぎよい gallant, manly; upright; undefiled, clean   
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明
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   あく to open   あける to empty   
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後
ゴ   コウ   のち    あと afterwards   うしろ behind   おくれる be late   
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日
ニチ   ジツ   sun; day   ひ    -か    
仕
シ   ジ   つかえる to attend to   
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事
ジ   ズ   こと thing; matter   
是
ゼ    just so, correctness, justice, right   
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非
ヒ   mistake
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目
ボク   モク   eye   ま-    め    
標
ヒョウ    sign, mark   
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