How learning English from intermediate to advanced?
Recently I sometimes feel that in the beginning of learning one language it's very simple like memorizing vocabularies, sentences and pronunciation, but in the intermediate level wondering how I can develop my English more (I know it's not only English but also other languages). Because I can estimate some words with vocabularies I've known already and I can't perceive very much whether my sentence is correct or not. So what I wanna say is what kind of way is more effective to learn English for developing from intermediate to advanced? What do you think?

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In my opinion Listening and speaking. When you watch movies/serials, you know what's happening, listen to what they are saying. Watch the episode once and then re-watch it to listen.
That's how you can catch your own mistakes.Speaking will bring your learning into practice.
If you can find someone to check your writing, then that's a good idea too. It will help you to correct your Grammar.
Reading, is good too, but re-read things to see how they are put together.

While listening and reading you can focus on how other people are putting there thoughts/ideas and stuff into words, different ways to express same feelings, different ways to respond to same questions.
In speaking and writing you can put your learning into practice.

I hope that helps.

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Pharase and verbs and idomatic expressions should be your focus. Try to speak with chunks (predone pieces of language) this way you will sound more natural ,To omoimasu!