The proficiency of the English language is a vital part of success in the highly competitive corporate world. English is mainly used in all forms of international business communication such as phone calls, emails, presentations, sales and marketing and even corporate legal documentations. 1. Good pronunciation always makes a good first impression. 2. It gives you an edge in other jobs and deals as well. 3. It is important for delivering presentations and speeches. 4. It will help you to communicate better with your colleagues in the US, EU and China.