Please find grammatical errors in the quoted sentences"

[oneupmanship1]

"Generally speaking, a native Japanese residing in Japan does not feel necessity nor has opportunities to exchange conversation in English language. Because Japanese language does everything. Similarly, in foreign countries, the local people who are learning Japanese there as a foreign language rarely have an opportunity for daily conversation in Japanese.

However, conversations constitute the vital part in learning foreign languages. They develop the speaking and listening skills in chain reactions.

But in the Internet age, the geographical restrictions can be overcome, because you can achieve global communications over Skype."

[Soup]

Using a language is a vital part in learning a language; however, Japanese learners of English residing in Japan do not feel the need to use English because it is not the language of survival in that country, and because of that there is not as much opportunity to use it. The same holds true for Japanese-language learners residing outside of Japan. They rarely have opportunity to converse in Japanese because they are not exposed to conversational Japanese on a regular basis. With the Internet age, however, geographical restrictions are overcome. Skype, for example, offers learners the opportunity and exposure they need to acquire a foreign language, no matter the country they are residing in at the time.

[Searching for language]

"Generally speaking, a native Japanese residing in Japan does not feel the necessity nor has the opportunities to exchange conversation in the English language. The Japanese language does everything. Similarly, in foreign countries, the local people who are learning Japanese there as a foreign language rarely have an opportunity for daily conversation in Japanese.

However, conversations constitute the vital part in learning foreign languages. They develop the speaking and listening skills in chain reactions.

But in the Internet age, the geographical restrictions can be overcome, because you can achieve global communications via Skype."

It is technically not incorrect to start a sentence with But, however etc., but both of the above sentences will stand alone quite nicely without using the words. I am not a teacher.