**13. Unless we had more rain, our crops wouldn't grow faster.**
- **Giải thích:** Câu gốc "If we had more rain, our crops would grow faster" có thể chuyển thành "Unless we had more rain, our crops wouldn't grow faster" để diễn đạt cùng một ý nghĩa.

**14. Unless I win a big prize in a lottery, I would buy a school for the poor.**
- **Giải thích:** Câu gốc "If I won a big prize in a lottery, I would buy a school for the poor" có thể chuyển thành "Unless I win a big prize in a lottery, I would buy a school for the poor" để thể hiện điều kiện ngược lại.

**15. If you are not careful, you will cut yourself with that knife.**
- **Giải thích:** Câu gốc "Unless you are careful, you will cut yourself with that knife" có thể chuyển thành "If you are not careful, you will cut yourself with that knife" để diễn đạt cùng một ý nghĩa.

**16. Unless you like this one, I'll bring you another.**
- **Giải thích:** Câu gốc "If you don't like this one, I'll bring you another" có thể chuyển thành "Unless you like this one, I'll bring you another" để thể hiện điều kiện ngược lại.

**17. If I don't have a quiet room, I won't be able to do any work.**
- **Giải thích:** Câu gốc "I'll not be able to do any work unless I have a quiet room" có thể chuyển thành "If I don't have a quiet room, I won't be able to do any work" để diễn đạt cùng một ý nghĩa.

**18. Unless she hurries, she'll be late.**
- **Giải thích:** Câu gốc "If she does not hurry, she'll be late" có thể chuyển thành "Unless she hurries, she'll be late" để thể hiện điều kiện ngược lại.

**19. If we had more rain, our crops would be better.**
- **Giải thích:** Câu gốc "Unless we had more rain, our crops wouldn't be better" có thể chuyển thành "If we had more rain, our crops would be better" để diễn đạt cùng một ý nghĩa.

**20. Unless she did her hair differently, she wouldn't look quite nice.**
- **Giải thích:** Câu gốc "If she did her hair differently, she would look quite nice" có thể chuyển thành "Unless she did her hair differently, she wouldn't look quite nice" để thể hiện điều kiện ngược lại.

**21. Unless the flood had risen higher, the crops would not have been ruined.**
- **Giải thích:** Câu gốc "The crops would have been ruined if the flood had risen higher" có thể chuyển thành "Unless the flood had risen higher, the crops would not have been ruined" để diễn đạt cùng một ý nghĩa.

**22. If John had not played for our football team, we would not have lost the game.**
- **Giải thích:** Câu gốc "If John had played for our football team, we would not have lost the game" có thể chuyển thành "If John had not played for our football team, we would not have lost the game" để diễn đạt điều kiện ngược lại.

**23. If I had a map, I could direct you.**
- **Giải thích:** Câu gốc "I don't have a map so I can't direct you" có thể chuyển thành "If I had a map, I could direct you" để diễn đạt cùng một ý nghĩa.

**24. If he took some exercise, he wouldn't be so unhealthy.**
- **Giải thích:** Câu gốc "He doesn't take any exercise, that's why he is so unhealthy" có thể chuyển thành "If he took some exercise, he wouldn't be so unhealthy" để diễn đạt điều kiện ngược lại.

**25. If I had seen the sign, I would have stopped.**
- **Giải thích:** Câu gốc "I didn't see the sign, so I didn't stop" có thể chuyển thành "If I had seen the sign, I would have stopped" để diễn đạt cùng một ý nghĩa.

13. More rain would make our crops grow faster.
14. If I win a big prize in a lottery, I will buy a school for the poor.
15. Be careful; that knife can cut you.
16. If this one isn’t suitable, I’ll get you another.
17. I can’t do any work without a quiet room.
18. She will be late if she doesn’t hurry.
19. Our crops wouldn’t be better without more rain.
20. She would look quite nice if she styled her hair differently.
21. The crops would have remained intact if the flood hadn’t risen.
22. If John had played for our football team, we wouldn’t have lost the game.
23. I can’t direct you as I don’t have a map.
24. He doesn’t exercise, which is why he’s so unhealthy.
25. I didn’t stop because I didn’t see the sign.