Dưới đây là đáp án và giải thích cho từng câu:

Câu 2 - 5: Viết lại câu với “If” hoặc “Unless”
2. Unless they practice regularly, they won’t improve their English skills.
→ If they do not practice regularly, they won’t improve their English skills.
(Giải thích: “Unless” mang nghĩa “nếu không”, tương đương với “If … not”)
3. Unless she goes to school on time, she will be punished.
→ If she does not go to school on time, she will be punished.
4. If you don’t bring books to me, I cannot return them to the school library.
→ Unless you bring books to me, I cannot return them to the school library.
5. If he doesn’t come back to his hometown on Tet holiday, his parents will miss him so much.
→ Unless he comes back to his hometown on Tet holiday, his parents will miss him so much.

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Câu 6 - 8: Viết lại câu với “Because of” hoặc “Because”
6. The prices increased because inflation was rising rapidly.
→ Because of the rapid rise in inflation, the prices increased.
(Giải thích: “Because of” + danh từ/cụm danh từ, ta biến “inflation was rising rapidly” thành “the rapid rise in inflation”)
7. The football match was canceled because the weather was bad.
→ Because of the bad weather, the football match was canceled.
8. Because of the heavy rain, we cannot go to the Aeon mall today.
→ Because it is raining heavily, we cannot go to the Aeon mall today.

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Câu 10 - 16: Nối câu bằng đại từ quan hệ (who, which, that, whose, where, whom, …)
10. This week, I’ve visited the school. I studied there when I was a teenager.
→ This week, I’ve visited the school where I studied when I was a teenager.
11. I didn’t like the film. We saw it at the cinema yesterday.
→ I didn’t like the film which we saw at the cinema yesterday.
12. We went to Phuket and stayed in a five-star resort. Its name is Six Senses.
→ We went to Phuket and stayed in a five-star resort whose name is Six Senses.
13. The bus goes into town. It stops at the school too.
→ The bus which goes into town stops at the school too.
14. Social media networks are an excellent tool. You can use them to promote your business.
→ Social media networks are an excellent tool that you can use to promote your business.
15. You can buy the pasta from that Italian shop. It has just opened in the high street.
→ You can buy the pasta from that Italian shop which has just opened in the high street.
16. I’ll call the students. I went to London with them last summer.
→ I’ll call the students with whom I went to London last summer. (Dùng “whom” khi có giới từ đứng trước, nhưng có thể dùng “who” và chuyển giới từ ra sau: “I’ll call the students who I went to London with last summer.”)