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When using a particular system you are said to be "in" that system. However, when using a particular version of some software, you might say that you are "on version 12". In this case, i think the "system" rule applies (especially since you use the word "system" in your question title), so it's "in" - your team member is correct.


Mentor as a verb is both transitive and intransitive: verb (used without object)to act as a mentor: She spent years mentoring to junior employees. verb (used with object) to act as a mentor to: The brash young executive did not wish to be mentored by anyone. (


I don't agree with Nick that they are literally identical in meaning (though I agree that they are in practice synonymous). To me, they have a different structure: 1) There are two [sides of the argument]. vs 2) There are [two sides] [to the argument]. My reason for saying this is that I don't find * a side to the argument to be idiomatic, so ...


They're literally identical in meaning, but using to, as you suggested, is more idiomatic (no clue why). As far as grammar goes, both to and of denote possession (i.e. The argument "possesses" two sides). Sidenote: The only more detailed answer I could give you would be making use of Latin grammar rules (which can often be applied well to English): of is ...


Clearly, my advice-giver does not understand someone's decision in pursuing an education and success in a foreign language, far away from home.

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