Dưới đây là cách chuyển các câu theo yêu cầu mà không làm thay đổi nghĩa:

1. He won't buy you a palace because he is not a millionaire.
-> If he were a millionaire, he would buy you a palace.

2. You forgot to lock the door, didn't you?
-> If you had remembered to lock the door, you wouldn’t have forgotten.

3. John ate too much birthday cake, so he was sick.
-> If John hadn't eaten too much birthday cake, he wouldn't have been sick.

4. You can't drive unless you have got a license.
-> If you don't have a license, you can't drive.