The English language has changed a lot since its foundation. It was influenced by occupations by the Roman Empire, Anglo-Saxons, Vikings and Normans. Anglo-Saxons formed the basis of modern English. A lot of words have assimilated, changed their meanings or were forgotten. The vocabulary was enriched with words from other languages.
English now is not the same as it used to be. It has a different way of putting words together then back then. The flexibility and simple grammar made English language an effective medium of international communication in spite of the difficulties caused by the difference between written and pronounced language.
Today English is the most popular language in the world. It became the international language for sports, business, commerce and other fields. Most of the mail is written and even most of the popular songs are sung in English. Even people who speak English with a different dialect can communicate with each other without any problems.
Good knowledge of English language opens up a lot of opportunities and enables us to communicate with almost everybody anywhere. It is the language of the world.
Picture reference:
http://www.dailygalaxy.com/photos/uncategorized/2007/10/11/language_2.jpg