Hi. Well, It's no necesary to think that this is only a negative connotation sentence. For example: 'You were the one who made my surprise party, thank you, you were the one behind this...' It means that he was the only one who cares, who did something special for someone... Of course you can blame someone with this phrase, but not always.

There's no difference. It's common to say in both ways. But I hear so much frequently the word 'present'. Example: 'Christmas presents' 'Birthday presents'. They are synonyms. But 'gift' also means something like an innate talent. Ex: 'Her voice is a gift'.

'Read in a book' it's when you read something in a book and you want to talk about that. Ex: I read in a book that vegetables are healthy. 'Read on a book' it's when you are on a book reading something. LOL weird but it could be a chair of books...

'That' is when you talk about something far. Further than 'This'. 'This' is about something near.

поп-музыка /pop-muzyka/

Sorry, I didn't read the description. In yoga you say "splits" when you get your legs wide separeted in line. There are many techniques to do a full split... This is called hanumanasana, or in spanish "la postura del mono" (monkey pose).

Mariusz, it's the same. You can say it both ways. The two of them are correct.

"Las Divisones"