1) She said to me she would go to Nha Trang the following week.

2) I couldn't finish the test in an hour because it was so long.

3) A new style of jeans has just been introduced in the USA.

4) I wish I could speak English well.

5) If he didn't work in the evening, he would have time to play with his children.

6) You can use this computer, can't you?

7) I wish I could remember the answers to these questions.

8) Nam said he had to go to Ha Noi the following day.

9) It takes Nga 4 hours a day to practice English with her friends.

10) It is raining heavily so we take our umbrellas.

11) Unless he works harder, he'll lose his job.

12) It is the first time I have been here.

13) Have you read this novel?

14) We had to cancel the game because it was raining hard.

15) Spending the weekend in the countryside is very wonderful.

=>
1. She said to me that she would go to Nha Trang the next week. ( câu gián tiếp -> lùi thì)
2. I couldn't finish the test in an hour because it was so long. ( because S V : bởi vì)
3. A new style of jeans has just been introduced in the USA. ( câu bị động thì HTHT)
4. I wish I could speak English well. ( câu ước -> lùi thì)
5. If he didn't work in the evening, he would have time to play with his children. ( câu điều kiện loại 2)
6. You can use this computer, can't you? ( câu hỏi đuôi)
7. I wish I could remember the answers to these questions. ( câu ước)
8. Nam said he had to go to Ha Noi the next day. 
9. It takes Nga 4 hours a day to practice English with her friends. 
10. It is raining heavily, so we take our umbrellas. 
11. Unless he works harder, he'll lose his job. ( unless = if not)
12. It is the first time I have been here. 
13. Have you read this novel?
14. We had to cancel the game because it was raining hard.
15. Spending the weekend in the countryside is very wonderful.