When/ I/ ten/ begin/ play football55/56When/ I/ ten/ begin/ play football.When I was ten, I began to play football.When I was ten, I begin to play football.When I am ten, I began to play football.When I was ten, I began play football.Giải thíchĐáp án A Dịch: Khi tôi 10 tuổi, tôi đã bắt đầu học chơi đá bóng.