1. Paula didn't decide to get married until she was twenty-nine. (Bỏ cấu trúc It was not until, đưa mệnh đề sau that lên trước, thêm didn't do đã bỏ đi not trong cấu trúc It was not until, do có trợ động từ nên decide phải ở nguyên mẫu)

2. I didn't wake up until the sun had risen. (Bỏ cấu trúc, thêm didn't do bỏ đi not trong cấu trúc, động từ woke chia về nguyên mẫu là wake)

3. Simon didn't realize his mistake until i had showed it to him. (Bỏ đi It was not until, đưa mệnh đề Simon realized his mistake lên, thêm didn't trước realized, động từ đưa về nguyên mẫu là realize)

4. The ice on the lake didn't thaw until the spring came. (Bỏ cấu trúc It was not until, thêm didn't và chia động từ thawed về nguyên mẫu là thaw)

1) Paula didn't decide to get married until she was twenty-nine

2) I didn't wake up until the sun had risen

3) Simon didn't realize his mistake until i had showed it to him

4) The ice on the lake didn't thaw until the spring came

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