I think GSM is something very difficult to learn English. Because I don't speak English so difficult a time study. Listen to English a lesson is innocent.
I think grammar is very difficult to learn English. Because I do not speak English, making it difficult to make time to study. English listening not just to know about.
I think the grammar is very difficult in learning English. Because I can"t speak English with the hard time for class. Don"t understand English can learn knowledge.