English is now one of the most commonly used languages in the world and one of the working languages of the UN as well. It is the native language of the UK, the USA, Australia and other countries. Besides, it is spoken as an official language or a second language in some countries. As a foreign language, it is learned in almost all non-English speaking countries. In China, for example, it is not only students but also many adults that learn English. It is said that more than 90 percent of the websites on the Internet are in English. So it is necessary to learn English well.