Billingualism

Bilingualism is mean that we can use two
languages. there are many languages in Indonesian for example Sunda.
my mother tongue is Sundanese. I usually using sundanese language, to
communicate with my friends and whole family. I using bahasa when I in
the formal situation or with the people who can't speak sundanese. I
can speak sunda very well because my parents is sundanese and I can
speak bahasa because bahasa is the national language.