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I want to add that if you add one more word and "-" sign:
"Кошка любит только одну сестру - мою." is "among all sisters only mine are beloved by this cat" without any doubts.


Intonation...

Yes, but opposite - you must put it to the begining: Только мою сестру любит кошка.

I think we can define some "novice rules" which can help at start.
First of all "-ся" means that action is directed to subject in most of all cases.
Let's examine:
1. Reflexive: Он бреется. / "Он...

> I may be a disgruntled worker of James but I would not plot his demise.
> Я возможно есть недовольный служащий в гаимса но я не готову его кончину.
"есть" in meaning "is" is supressed in natural...

I think it must be: "Оскорбление Христа (Христоса) - это оскорбление Митрополита Киевского".
Христа/Христоса - genitive.
Митрополита Киевского - genitive.
"Во Христе" (prepositional) is used in...

> "Ударять" is used rarely. We use "бить" instead.

Yes.
"Ударить" is "to strike once" (event)
"Бить" is "to beat (to do many strikes during period of time)" (process)

"Ударять" form is...

> By the way, if sentence have no passive voice the word "изменила" is right, not "изменило", because "жизнь" is female.

"Изменило" can be used here. Example: "Его выкинуло из машины и несколько...

"Его страсть к ясности неизбежно привела его к математике."
mathematics is science. In Russian "математика" (single, fem.).
Математики in Russian is "mathematicians" (plural, male). It is very...