This goes for other languages too, but it has to be your primary language. You have to understand the language fluently, and speak it every day and only then will you do it.

learn chinese please , japanese came from chinese ,bealive me.

I think out a good way to practise foreign language thinking. It is starting to memorise some sentences, remember to say it whenever you can say it in your daily life. Try it every day I believe it will work.