Shirley didn't begin to read until she was eight. 

=> It was not until _____________________________.

Đáp án: It wasn't until Shirley was eight that she began to read.

Giải thích: It + be + not until + that...: mãi cho đến tận khi...

Dịch: Mãi cho đến tận khi Shirley 8 tuổi thì cô ấy mới bắt đầu đọc.