You really have difficult questions, seems you are deep into the grammar ^_^ The easiest explanation can be, when in the context of a sentence you can mean "own and not others" while you have kinda possessive relation to the thing or even more, positive possessive relation. Svoj is gender nonsensitive word. Svoj can mean - my own, your own, his/her/their own. It's obvious that my sister is moja sestra and she is only mine, not your sister, (because we are not brothers), so I do not need to specify "s mojou sestrou", rather use general word "svoj", so that's why so svojou sestrou. ______________ If I wrote "you often draw pictures with your sister", does that become "často kreslíš obrazky so svojou sestrou"? Yep, you got it. If I am asking about your sister, so we know it is your sister and nobody's else, just your one - this is what is meant by mean "positive possessive relation" ^_^ ______________ ============== In English I think there is not any equivalent to the word svoj, as it is said, svoj is used with all grammatical persons, let me give you some examples of using svoj: I will just take MY THINGS and go home. -> Len si zoberiem SVOJE VECI a pôjdem domov. (you take just your own things and not others', you can say: Len si zoberiem MOJE VECI a pôjdem domov. It's the same meaning, but to our ears "svoje" fits better) (English phrase) It's not your business. (Literally in Slovak: Take care about YOUR THINGS) -> Staraj sa o SVOJE VECI. (so take care about your own business and not mine not others, you can also say: staraj sa o tvoje veci, it's also understandable, but to our ears svoje fits better again) Everybody has HIS/HER OWN troubles. -> Každý máme SVOJE starosti. (like: life is not easy and everyone has some annoying stuff in the life which is bothering him/her self alone, not others) If you are at interview, they may ask: Introduce us YOUR OWN ideas. -> Predstavte nám svoje nápady. (Here svoje means "your own", you can use vaše nápady. But while you have possession or relation to that (those are your own ideas not others ones), so they rather say svoje nápady than vaše nápady) A lot of other examples and also explanations of this word you can find here: http://slovniky.juls.savba.sk/?w=svoj&c=69c4

Allow me please firstly correct your Slovak question ^_^ Aký je rozdiel medzi "keby" a "ak"? Obe znamenajú "if", ale ako ich mám použiť? Check the explanation and examples here: ak: http://slovnik.juls.savba.sk/?w=ak&s=exact&c=96fd&d=kssj4&d=psp&ie=utf-8&oe=utf-8 keby: http://slovnik.juls.savba.sk/?w=keby&s=exact&c=Rffd&d=kssj4&d=psp&ie=utf-8&oe=utf-8 Main difference is that "keby" is used when you wish something: If I would have known Slovak language. -> Keby som tak vedel po Slovensky. When I am thinking about that, it seems that when we use "keby", then we are using the verb in past tense. And when we use "ak", we rather use present or future form of verbs. If I learn more, I will understand it. -> Ak sa budem viac učiť, pochopím to. If I would have learnt more, I would understand it. -> Keby som sa viac učil, pochopil by som to. (I wish I would have learnt more) If there is rain, I would not need to water a garden. (I wish there it is raining.) -> Keby pršalo, nemusel by som ísť poliať záhradu. If there is rain, I have to stay at home. (I do not wish it, it is a fact, if it's raining, my mom do not allow me to go out, for example.) Ak prší, tak musím byť doma. So I would say that in general "keby is used in conditional sentences when I wish something, and "ak" is used when something is a fact, a real thing. Except of "wishing" there is so called "not finished condition" when we use "keby". If you speak for a long time, we are bored. -> Ak rozprávaš dlho, nudíme sa. (it is a fact, done) If you would speak for a long time, we would be bored. -> Keby si rozprával dlho, nudili by sme sa. (it is not a fact yet, it haven't happened yet and even nobody wishes to be bored :-D ).

Examples of Slovakian tongue twisters: - Išiel pštros s pštrosicou a pštrosíčatkami Pštrosou ulicou. - Vyskočil vyskočil, Vyskočilku preskočil, Vyskočilka vyskočila, Vyskočila preskočila. - Keď nenaolejujem linoleum, tak naolejujem lampu. Keď nenaolejujem lampu, tak naolejujem linoleum. Try to repeat following 3 times: - Strč prst skrz krk. - Na klavíri hrala Klára Kráľová. - Pes spí, psy spia. - Tak ty takto tatko.

Not sure if this is question for learning czech or just status, but allow me to mention that in this kind of sentences (sth from/by sth, sth from/by sb), "od" is used as "from/by" person, company's name... "z" is used when referring to countries, cities, institutions, nonliving things... so correct form should be: Kde jsou balíky z ČR? Kde jsou balíky od Chunghwa Telekomu? More info and examples about prepositions can be found at http://www.locallingo.com/czech/grammar/prepositions.html