what do you think is the hardest part or most challenging part about studying English?

Hello [이름]. Studying grammar through books is helpful. However, application is quite challenging. Practice is necessary to improve. When I say practice, I mean actually speaking the language. You have to expose yourself to situations where you get to use English. The more you are exposed to using the language, the more familiar you\'ll get with it. Good luck!

T. Beth
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First, Grammer is hard to me.

>>> First, Grammar is hard for me.   

I have learned English from elementary school so I always studied English grammer.

>>> I have learned English since elementary school so I have always studied English grammar.   

But When I want to talk using English in real life, I forget appropriate grammer.

>>> But when I want to talk using English in real life, I forget appropriate grammar.   

I think there is big gap between learning grammer through the book and using grammer in real life.

>>> OR: I think there is big difference between learning grammar through the book and using grammar in real life.   

So I want to know how can I study English grammer successfully.

>>> So I want to know how I can study English grammar successfully.   
 So I wish that Someday I will able to communicate with foreigner quickly.

>>>   CORRECT.

And I hope reading art theory book written English accurately, since many art theory book are translated in Korea after a few years and I heard that if I study in art graduate school, I have to read a book written English.

>>>   In addition, I hope to read art theory written in English accurately since many art theory books are translated in Korean after a few years and I heard that if I study in art graduate school, I have to read a book written in English.  

So If I enter the graduate school next year, l will be confused.

>>>   CORRECT.