Because English is the best language in the world!

Hmm? As you are learning that yourself, you could answer that yourself already .

learning English is not restricted to Chinese people, people from different nationalities want to learn it because it is thought to be an international language and it is also the language of science as most important researches are written in English..

不是喜欢，是被迫的，懂吗？谁叫汉语不受欢迎，别人对汉语不感兴趣，所以只能说别的语言了。而且还是一大群chinese求一个英语母语者

English is very uesful,and in Chinese,that is a very important subject.