Under japanese rule, korean students were taught by japanese teachers, korean names were changed to japanese names, and practically everything korean was abandoned. the japanese were guilty of

The Japanese would be guilty of abandoning Korean entirely.

Explanation:

This would be because if the Korean students kept Korean and learned fluent  Japanese, all the Korean students would be bi-lingual. Also, the Korean students could know both Korean and Japanese culture and now how to act accordingly!

yes.

explanation:

because it let the japanese know who had the upper hand in the war.

i believe it was spain