Для нас разницы нет.. А у англичан это разные времена :) Во втором примере, I has been to Russia, это так же может означать, что ты до сих пор в России (иногда), а может, уже и вернулся. Если ты скажешь I was in Russia, то тут однозначно, что ты уже вернулся. P.S. Верно говорить I have, has употребляется только с третьим лицом единственного числа (He, she, it) I was in Russia - не очень красиво звучит.. Лучше сказать что-то вроде I visited Russia или I've been in Russia.

It's a matter of using the correct tenses. 1) I have never been to Paris. 2)I have been to Russia. or Last week, I was in Russia .

It should be: I never went to Paris. (Not, I never gone to Paris.)- This would be used if you for example if your friend says "How was Paris last summer." and you could say "I don't know, I never went to Paris." Basically this phrase is used more as an explanation to something or as a response to something. I have never been to Paris.- This means you have never visited Paris or physically been there. I have been to Russia.- This means you have visited Russia in the past. I was in Russia.- This is more like saying that you were just in the country of Russia at the past time referred to.

Except for your last sentence, "I was in Russia", all others are grammatically incorrect or improper English. 1. I have never BEEN to Paris. 2. I HAVE been to Russia. "I" is considered to be plural. So no singular verbs. I go to Russia. NOT I GOES to Russia. I only sing for my girl friend. NOT I only sings for my girl friend. "Am" is the verb to use instead of "is". "I is a man" is uneducated English. It should be "I am a man". Don't ask me why all these rules. They are made by people who spoke English first.

Кстати, в первом примере в принципе это 2 одинаковых предложения, просто в первом варианте пропущено have, так иногда делают подростки, вроде сленга. Тем, кто только изучает язык, лучше употреблять полную форму.