The formal-form ("desu"-table) using if you e.g. with teacher or with another higher person speaking...
And the daily-form ( "da"-table) using if you with your family or with friends (how I)...etc. speaking...
E.g.: I'm would your teacher be, then would you to me say: "O-hayou degozaimasu x-sensei! (Good morning x-teacher!) Kyou wa ii tenki desu ne~ (Today is a nice weather~)". And I if your firend would (but we are), Then so: "Kimi ga ii da (You're nice...)...etc."
I find that the best way to learn kanji is to get some Japanese reading material and have a dictionary beside you as you go. It's painfully slow but it gets absorbed.
Hi man! Thanks as always for sharing.
I've downloaded the RJ01343313 mp3 file, however the folders are empty (the ones supposed to be with the mp3 files).
There is only files in samples folder, which have other works of the same publisher.