1) He forgot about the gun until he got home. => It was not until 2) She weren't allowed to open her presents until her birthday. => It was not until (giải thích cấu trúc giúp mình luôn nha)

CẤU TRÚC: IT WAS NOT UNTIL + [MỘT MỐC THỜI GIAN/MỘT SỰ KIỆN NÀO ĐÓ...] + THAT + CLAUSE: MÃI CHO TỚI KHI...THÌ MỜI

1. It was not until he got home that he forgot about the gun.

Nghĩa: Mãi đến tận khi anh ấy về nhà thì anh ta mới quên về khẩu súng.

2. It was not until her birthday that she was allowed to open her presents.

Nghĩa: Mãi cho đến sinh nhật của cô ấy thì cô mới được phép mở quà.