私がすでに英語を話し、私が米国に住んでいる場合、どの言語が最も役立つかを学ぶことをお勧めしますか？私がすでに英語を話しているかどうかを学ぶために最も簡単な言語をお勧めしますか？
Can you recommend which language would be most helpful to learn if I already speak English and I live in the United States? Can you also recommend the easiest language to learn if I already speak English?