Dưới đây là các câu đã được chuyển đổi với nghĩa không đổi:

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.**

Hy vọng những câu này giúp ích cho bạn!