Comment by killedbydeath

It's not obvious that speaking second language better will come out at the expense of English. I grew up bilingual and was at the top of my class for my second language compared to monolingual natives. There are whole countries of bilingual/trilingual people in Europe who speak their main language very well still. I think knowing a second (and later third) language gave me a better understanding of language structure. Same in sports, if you are athletic, you will have easier time picking up new sports.