Hi, You basicly distinguish them from the context and the speaker's intonation.

Let's go with "что-нибудь". It's quite difficult :). To begin with, "Нибудь" alone doesn't mean anything. With anything - Ни с чем; with something - C чем-нибудь To see something - Увидеть что-нибудь; To see anything - could you provide some entire sentence here? Without anything - "Ни с чем" or "Без ничего"; Without something - "Без чего-нибудь".

Hello, We don't have any particular word for "anything" in Russian. We just use the double negation in the case of negative phrases. For exemple: "I don't understant anything" - " Я ничего (=nothing =anything ) не понимаю."; " I didn't do anything" - "Я ничего не сделал". And we use "что-нибудь" for questions: "Anything else?" - "Что-нибудь еще?"; or "кто-нибудь" for people: "Could anyone help me?" - "Мог бы кто-нибудь (=someone =anyone) мне помочь?". And finally for ordinary sentences "кто угодно" or "что угодно": "Anyone could arrive now" - "Кто угодно мог бы прийти сейчас"; "It can be anything" - "Это может быть что угодно".

The examples you provide sound the same. Accents serve to differentiate their meaning in the written form. In the spoken form the words are distinguished by the context.

I'm not sure what you exactly mean, but it might be cases when you omit que first part of the sentence. For example: - When someone is very insistent and you answered him "no" several times, eventually you can say: " Te he dicho que no" or "Que no", omitting "Te he dicho". - In case of "Que Dios te bendiga" I think it would be a similar example (not sure though). It would be as if you wanted to say "Quiero/deseo que Dios te bendiga" and you only say the second part of the sentence.

Сначала нужно нажать на кнопку "э" (на что компьютер никак не отреагирует), а затем любую гласную.