日本語と混ぜれば行けるのか? → いけた
The best way to learn English is just to study. The most important factors which you get matured in English are how long and how deep you studied.
The way of studying is not so important. You must choose the way what you feel most comfortable to study, because you can keep studying much more with such things.
I think the grammar have huge importance for second language learners. Grammar is the key to correctly communicate each other.
And if you are Japanese, you have to practice pronunciation and intonation carefully. Sound structure of Japanese language is too poor. You never distinguish English's fertile sound representations without strict learning.
ちょっとその記事英語で書いてみてくれませんかね? 英語の上級者じゃなくて英語の勉強法の上級者になってるんじゃないの?
テスト
ダイエットとか近縁の話と似てるよね