нужна проверка грамматики, помогите пожалуйста.

Nowadays there are about six thousand languages around the world. But many languages are endangered. And even greater numbers are extinct.

At all times, the language was not only a means of communication, but also cultural heritage. Language vanishes when its last speaker dies. Together with them dwindles world culture and disappears a piece of history. For example, in the works of well-known British linguist David Crystal, Set an unknown language Kasabe. His last native speaker died in 1996, leaving absolutely no information about the language and its history. However, what will happen to the world if languages will continue to disappear? Rare languages will disappear first. As a result, many centuries later turn comes up languages "giants." This means that someday people will lose their ability to communicate with each other, world culture will be devastated, will begin a general degradation. Humanity will return to the primitive age. Do we want such an outcome?

 Nowadays there are about six thousand languages around the world. Butmany languages are endangered. And even greater number s are extinct.At all times,  language was not only a means of communication, butalso part of cultural heritage. Languages vanish when their last speaker dies. With them dwindles the world’s culture and apiece of history disappears. For example, in the works of the well-known British linguist DavidCrystal, the formerlyunknown to the world Kasabe language was recovered.Its last native speakerdied in 1996, leaving absolutely no information about the language and itshistory. So, what willhappen to the world if languages continue to disappear? Rare languages willdisappear first. As a result, many centuries later the "giant" languages’ turnwill comes. Thismeans that some day people willlose their ability to communicate with each other, world culture will bedevastated, a general degradation will start. Humanity will return to the primitive age. Do we want suchan outcome?
Прежде, чем работать над грамматикой, надо бы поработать над стилистикой.
А то, коряво местами, не говоря уже о том, что - спорно. Но это уже вопрос к автору.

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