My sister began to learn English when she was six years old.
Giải thích
Đáp án
My sister has learnt/has been learning English since she was six years old
Giải thích: S + began/started + to V/Ving...ago = S + have/has + Vp2 + for/since...
Dịch: Chị gái tôi đã được tiếng Anh được 6 năm rồi.