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I know what one of them is なくてはいけません and the other one なければなりません, I just don't know which is which, also a few example sentences would help a lot, thank you.

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Obviously ・・・しなくちゃ is a contracted form of ・・・しなくては(なりません)/・・・しなくては(いけません).

ex. 勉強しなくちゃ。
=勉強しなくては。
=勉強しなくてはなりません/勉強しなくてはいけません。


・・・しなければ can be contracted into ・・・しなけりゃ but we don't say '・・・しなけりゃ。' to mean 'I gotta do...'

×勉強しなけりゃ。
○勉強しなけりゃ試験に合格しないよ。


And I think ・・・しなきゃ is a contracted form of ・・・しなけりゃ(いけない)。
http://okwave.jp/qa/q441217.html (See A no.2)

ex. 勉強しなきゃ。
= 勉強しなければ。
= 勉強しなければなりません/勉強しなければいけません。


You can also say 勉強しないと。/勉強せねば。

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Ahhh thanks cypher-san, now it looks so neatly organized, but...how did you do that...? lol –  Chocolate Jan 7 '12 at 6:04
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I've tried to write an article on how to use the editor here at meta.japanese.stackexchange.com/a/626/796, I hope it's useful :) You can also read the full guide at japanese.stackexchange.com/editing-help. –  cypher Jan 7 '12 at 9:54
    
Ahhhhh thanks again!! Your post will be sooo helpful!! –  Chocolate Jan 8 '12 at 6:37
    
Is "勉強しなけりゃ試験に合格しないよ" actually "勉強しなけりゃ(ならない)試験に合格しないよ"? Can I elide that portion even though it's not at the end of the sentence? –  Flaw Jan 9 '12 at 10:52
    
@Flaw san, The phrase 'しなけりゃ' can only work as 'unless', and can't replace 'しなけりゃならない'. (Literally, しなけりゃならない is "しなければ=if you don't" + "ならない/いけない=it doesn't work".) 'しなけりゃ' in '勉強しなけりゃ試験に合格しないよ' means 'if you don't...', and we don't say '勉強しなけりゃならない試験に合格しないよ'. –  Chocolate Jan 9 '12 at 12:56
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