[noodle]

I believe that when someone learns a foreign language, that is the only language that should be used to teach. It might be harder at the start, but this is a much better way of learning the language in the long run.

It's never a good thing learning a language while trying to think in a different language. I find that most French people I speak to, have problems with English because they try to think in French. This will be the same case for a Japanese speaking English, and vice versa. Think in the language you're learning and don't try to relate to your other language(s).

The only time Japanese should be used in an English class is if you've totally failed to explain the meaning of a word (vocab). For example. If someone doesn't understand the word Hat. First you should try to explain it by describing what it is, what it's for etc etc. IF the student is still unable to understand, then you just say the word in Japanese and ask the students to make a sentence or two using "hat".