YOU SAID:
I didn't eat a hamburger last night
INTO JAPANESE
昨夜はハンバーガーを食べなかった
BACK INTO ENGLISH
I didn't eat a hamburger last night.
INTO JAPANESE
昨夜はハンバーガーを食べませんでした。
BACK INTO ENGLISH
I didn't eat a hamburger last night.
Come on, you can do better than that.