Generally speaking the first language is marked by the accent and regional expressions of the area where students grow up. An infant after its birth first learn the mother tongue, then as it enters school parents decide a foreign language as first language but in thatcase the child is more used to or fluent in speaking its mother tongue, that's why for ex. When he speaks English his regional accent and expressions is more audible in it. This fact can be clearly identified between a Bengali boy and Tamil boy speaking English.