Ngữ pháp tiếng anh "IT WAS NOT UNTIL ....THAT...."

It was not until + time word/phrase/clause that + clause EX: 1. She didn’t become a teacher until yesterday. = It was not until yesterday that he became a teacher. time word 2. He didn’t come home until late in the evening = It was not until late in the evening that he came home. time phrase 3. He didn't know how to swim until he was 30 years old. = It was not until he was 30 years old that he knew how to swim. time clause