Thanks to all of you !!!
Now, I know the difference !
Thanks a lot, really !
@ m4x30000 : You used kurasu for class. And yesterday, I listened to some StereoPony and heard the term buko. (I believe the kanji would be : 部子)
So I have a new question : Which one to use in everydays life ?
@ Sashimister : I love your examples. Trying to translate them ^^
And here is what I answered :
1/ I started judo at the age of 10.
2/ The movie started 5 minutes ago.
3/ Well then, class starts.
4/ I think that German started in University. (What does いと mean ?)
5/ Hmmm ... I have some trouble translating it correctly. "Love started when I met you"
6/ ??? Lol, I kind of understand but I can't translate it at all. "I kind of started Japanese" ...
Help ^^