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Grammar detail: ば conditional + いい

ば conditional + いい - should
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ば conditional
+
いい
means
should ~; it would be good if ~
The conditional form means 'if ~', and いい means 'good', so the combination becomes a useful expression meaning 'it would be good if ~', often simply translatable as 'should'.
すみませんどこ
りれば
いいです
Excuse me, where should I get off?
なに
って
けば
いいです
What should I bring?
どのボタン
せば
いいわからなかった
I don't know which button to push.
The phrase is also used for giving permission, so it would be translated as 'you may' etc:
その
ほん
どちら
っていれば
いいです
You may take either of the books.
Another common use of this form is to say 'I wish ~', 'I hope ~' etc. For example:
あした
明日
あめ
らなければ
いい
おも

I hope it does not rain tomorrow.
せんそう
戦争
こらなければ
いい
おも

I hope war doesn't break out.
あした
明日
まで
あめ
めば
いい
おも
います

I wish it would stop raining before tomorrow.
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Kanji used in this grammar

コウ   おりる to get off   おろす to drop off   ふ to fall (eg rain)   
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カ   なに    なん what?   
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ジ   も to hold, to have   
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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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オウ   お to push   おさえる to check, to restrain   
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ホン   book   もと origin   
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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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ニチ   ジツ   sun; day   ひ    -か    
ウ   あめ    あま- rain   
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シ   おも to think   
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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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キ   おきる to wake up, to get up   おこる to happen   おこす to rouse   
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シ   とめる to stop   とまる to stop   
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