How do you write i will go to japan in Japanese?

Answer 1

私わ日本に行く

watashi WA nippon ni iku

____________________

nihon, not nippon.

No one ever says "nippon" in spoken japanese, ever, unless they're doing it in a sarcastic way (or are super right-wing), as it carries extremely right wing and imperialistic connotations. It would be kind like saying "these United States of America, one nation under god, forever" every time you would normally say the word "america".

Answer 2

いつか日本に行きます。 Itsuka nihon ni ikimasu.
Pronounced: ee-tsoo-kah nee-hown nee ee-kee-moss.