How do you say ジョン： いつも勉強してどうするんだよ。皆で遊びながら日本語を練習するのがよっぽど勉強になると言うのに。 in Japanese?

John: What are (you) going to do, studying all the time? Despite the fact that (It’s) said that you’ll get a lot more studying by practicing Japanese while playing with everybody.