arigatou.

arigatou.

minna-san.....
watashi wa hontou ni arigatou gozaimasu. 

minasan, hontou ni arigatou gozaimasu. or watashi wa hontou ni arigatou (gozaimasu) to iitai desu. 

*"watashi wa arigatou gozaimasu" doesn't sound well to us.

(because all of you help me to teach a japan languange.

nazenara minasan wa nihongo wo oshieru koto de watashi wo tetsudatte kureru kara desu. 

Or saying in easier way, nazenara minasan wa watashi ni nihongo wo oshiete kureru kara desu. )

mouichido...
arigatou gozaimasu! :D

Lots of Japanese will help you, please keep studying our language!