How would you say ‘i have been studying Japanese for four years?’ in Japanese?

Watashi wa 4-nenkan nihongo o benkyō imasu.

Explanation:

the o at the end of benkyō was kind of hard to do. I found out that if you hold o for 1.5 seconds, a list of different o's you can choose from

i remember a kid from africa moved to our school and she didn't speak no english. well she did but it was very limited but all the kids including me would ask her question like has she ever hunted a elephant or ever been hunted by a lion. to us she was so interesting even thought she was ordinary but by the fact she was from a different country we thought things were different. (honestly i asked her if she lived in a mud house on the savanna.) do i feel bad about approaching her yeah but do i feel bad about asking her question no because i would have never found out all the cool things about africa that aren't true