Please, help me translate a question. 私たち人間は、人間のことだけ心配すればようにのでしょうか？

～なきゃいけない-ending, what is it? I never meet this ending before. Please, explain me functions and situations where this ending may be used. Whole sentence, there this ending is in two plases: 私たちだって眠らなきゃいけないし大きな魚に食べらなように隠れなきゃけないから。 My variant of translation: We are looking for a place, there we could sleep and hide from big fishes.

Please, help with translation (Just one phrase). I try to translate Japanese book for child in Russian language. This phrase I can't translate, because I don't understand, what a place should I see, when I open my eyes :) 目をさますと見しらめ場所....。

How can I "japanise" my PDA? I wanna set Japanese language for my pocket PC.. Have you any ideas which way can I do it? Model of phone: Samsung i-710 OS: Windows Mobile 6.0

嬉しい、喜ぶ、楽しむ・・・these all about joy, but... What's a difference and which situation is the best to use every of this expressions?

~て見る　Ｏｒ　～てみる May i write this sentence (in meaning "to try") with kanji? Or only katakana?

決める、～にする　what's better to express "decision?" 1．Which situation every of this variants in? 2．Second ~たい、積もり - I know that first is very usefull, but what is the unique of second? They both are needed to express wishness...

How to say "to get in(to)"? For example to get in disaster: I know that there I should use verb "au", but which "au"?: 1．事故に会います。 2．事故に合います。 It seems to me that second variant is correct, but I'm not sure.

~なくてはなりません　＆　~なくてはいけません What is the difference? And wich sitation I use this endings and ~しなければなりません　in？ I guess that the first is needed or adj, second for verbs and this is means "should"... but third means "must"... Am I right?