Components

Grammar detail: 〜ではないだろうか

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JLPT:
〜ではないだろうか - could it be that~; might it be that~
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noun
+
ではないだろうか
means
could it be that~; might it be that~
あの
ひと
わたし
たち
あたら
しい
せんせい
先生
ないだろう
He might be our new teacher.
けんさ
検査
てお
手落
あったないだろう
I suspect that there was an oversight in the examination.
Other patterns:
verb plain
+
のではないだろうか
い adjective
+
のではないだろうか
な adjective
+
+
のではないだろうか
When speaking politely でしょうか should be used rather than だろうか, as can be seen in the next example. It is also a useful expression to make suggestions to people that may require a level of sensitivity. This is also demonstrated in the next example.
しゃか
釈迦
せっぽう
説法
ぞん
じます
いしゃ
医者
きんえん
禁煙
された
ほうよろしいないでしょ
I'm sure you don't need me to tell you this, but wouldn't it be a good idea to stop smoking?
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Kanji used in this grammar

ジン   ニン   ひと man   
1
シ   わたくし    わたし I, myself   
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2
シン   あたらしい    あら    にい- new   
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2
セン   さき ahead   
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1
セイ   ショウ    life   なま raw   いかす to enliven   いきる to live   いける to arrange flowers   うまれる to be born   う to give birth to   き pure, undiluted   お to grow, to sprout   はえる to grow, to sprout   はやす to grow, cultivate   
1
ケン    investigation   
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5
サ    investigation   
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4
シュ   hand   て    た-    
2
ラク   おちる to fall   おとす to drop (something)   
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3
シャク    explanation   
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5
カ   (no meaning)
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セツ   ゼイ   と to explain, persuade   
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3
ホウ   ハッ   ホッ    method   
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3
ソン   ゾン    suppose   
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3
イ    doctor   
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2
シャ   もの person, someone   
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2
キン    prohibition   
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4
エン   けむり smoke   けむ to smoke (chimney etc.)   けむ smoky   
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3
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