If you came to Belgium for professional reasons, you are likely to work and live in Brussels. If not, you are probably situated close to the capital.
Although Brussels is an increasingly international and therefore multilingual city, French remains without any doubt the main language of communication.
It is very difficult to get a job in Brussels or Wallonia if you don’t speak French well.
Even if you work in an international organisation, you will have to get by in town, when going to a shop or a restaurant, talking to people in the street or any other place you might visit.
If you work here for several years, you don’t want to limit your social life to your fellow-countrymen but broaden your circle of friends as much as possible.
If you come from Flanders, the Northern part of the country, looking for career opportunities in the large, national companies, you will also find out that French is an essential tool to reach your full professional potential.
The French language allows you to talk to your colleagues in professional and informal circumstances alike. That is when language classes become a great idea.