hi,lizze,well ,it's hard to expain why,but i have a good idea,cause once i translate it into english, the problem is gone. let me expain them one by one
1、I like studying languages very much.(there is no point to add"many"before language,so does it in Chinese)
2、Because once i know many languages ,my world will become larger(you can't leave "once"and "will")
i hope these could be helpful