I think English is difficult because it is not our native language's language, but it can be learned, both good at speaking, listening, reading and writing.
I think the difficult English Because my English is not our mother tongue. I can learn to be good at it. Both of speaking, listening, reading and writing.
I think English is difficult because it wasn't his father our mother tongue. But you can learn to do better, both in speaking, listening, reading and writing.