"Just when I thought I was getting used to the environment, things went back to how they were before."
"Just when I thought I was getting used to the environment, things went back to how they were before."
"Just when I thought~" 「〜と思ったら」
"I was getting used to ~" 「〜に慣れてきた」
"the environment" 「環境」
"things went back to how they were before”「以前の悪い時の状態に戻った」
"went back" 「戻った」
"how they were before”「以前の時の状態」
[慣れてきた](https://eikaiwa.dmm.com/uknow/questions/22257/)についてもっと詳しく知りたい方はクリックしてください。
Just when I thought I had become adapted to my new environment, things returned to the old bad conditions.
ご質問ありがとうございます。
「環境に[慣れてきた](https://eikaiwa.dmm.com/uknow/questions/55866/)と思ったら以前の悪い時の状態に戻った」は英語で「Just when I thought I had become adapted to my new environment, things returned to the old bad conditions.」と言います。
ご参考になれば幸いです。
オーストラリア 
アメリカ合衆国 
