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でなくては
denakuteha
JLPT N1
Edit  dc
Meaning
if not.. then noone
noone but him can do this
Edit  dc
Formation
See also
Phrases
こんなおいしいりょうりはははおやでなくてはつくれない。
Noone but mother could make this delicious food
Edit  #5017 dc
そうでなくてははなしにならない。
There is no point in discussing it unless that would be the case.
Edit  #5036 bamboo4
どんなにおかねがあってもけんこうでなくてはにんげんはこうふくにくらせない。
No matter how rich one may be, one cannot live happily without health.
Edit  #5058 dc
くりはすくなくとも15ふんはゆでなくてはいけない。
Chestnuts have to be boiled for at least fifteen minutes.
Edit  #5059 dc
きみたちがくせいはきんべんでなくてはならない。
You students are supposed to be diligent.
Edit  #5060 dc
しょくもつはいきるうえでなくてはならない。
Food is essential to life.
Edit  #5061 dc
やくそくにはちゅうじつでなくてはいけない。
You must be faithful to your word.
Edit  #5062 dc
きみでなくてはこのほんはかけない。
Nobody except you can write this book.
Edit  #5459 bamboo4
Discussion and comments
でなくては is used in negative sentences.
(thing that must be)でなくては(what can't or won't be done without first part).
sarruby
でなくては書けない=だけが書ける=以外には書けない=をおいて他には書けない can be used for #5459, and with appropriate modification for #5017,but note that they are not ready replacements for other examples.

You may want to think why.
bamboo4
what's up with no one being misspelled twice?
Claytonain
its waiting for you to edit + correct claytonian. feel free to improve the content...
dc