来年東京に”行きたい”のでもっと日本語を勉強したい(です)。 ・Adding です at the end becomes more polite. ・want to do something: ~たい The following site would be useful. https://atsukojapaneselesson.wordpress.com/japanese-grammar/verb/lesson-13-conjugation-verbs-to-%E3%81%9F%E3%81%84-form/