Viết lại câu sao cho nghĩa không đổi

Dưới đây là các câu đã được viết lại mà vẫn giữ nguyên nghĩa:

1. Her son said that he was in the school canteen then.
2. If people do not take this course, they won't pass the exam.
3. If the temperature increases, some aquatic creatures are unable to reproduce.
4. I said that I had overslept that morning.
5. My mother asked where I had come from the night before.
6. You should go by bus instead of car because it has environmental benefits.
7. Khanh has to take a course to improve his English.
8. Most of our classmates find TV game shows enjoyable and interesting.