It was only when he left home that he realized how much his family meant to him
It was only when he left home that he realized how much his family meant to him.
=> Not until ______________________________________________.
Đáp án đúng là: Not until he left home did he realize how much his family meant to him.
Giải thích: Cấu trúc đảo ngữ với Not until: Not until + trợ ĐT +S + V…
Dịch: Mãi cho đến khi anh rời khỏi nhà, anh mới nhận ra gia đình có ý nghĩa như thế nào đối với anh.