Since I have started studying English, I have started to think about how to say certain things in English
この文章が以下のように翻訳されています。
英語の勉強始めてから、英語でどう言うか考えるようになった ー Since I have started studying English, I have started to think about how to say certain things in English
英語の勉強始めてから、 ー Since I have started studying English / Since beginning my English study / Since studying English
英語で ー in English
どう言うか ー what to say / how to say
考えるようになった ー I have started to think / I have started thinking about / I have started to wonder
参考になれば嬉しいです。
Ever since I started studying English, I've started thinking about how to say things in English.
Ever since I started studying English, I've started thinking about how to say things in English.
Since I resumed learning English, I constantly think about how to express myself in English.
「英語の勉強を始めてから、英語でどう言うか考えるようになった」という変化や習慣を伝えるには、"Ever since ~"(〜して以来)や "start -ing"(〜し始める)、"how to say ~ in English"(英語で〜をどう言うか)という表現を組み合わせるのが自然です。