1. Reported speech: 1. “I am having a good time here” said Maryam. → Maryam said  2. “I’m going on the Internet now.” Minh said. → Minh said  3. She said to me, “I will go to China next week” →She said to me 4. “I must leave here for Nha Trang tomorrow” Mr. Phong said. → Mr. Phong said  5. “Are you going to help me?” Nam said to Lan. → Nam asked Lan  6. “Can you play the piano?, he asked the girl. →He asked the girl  7. Mai asked Mary, “Can you speak Vietnamese?” → Mai asked Mary  8. “Do you stay at home today?” She asked me → She asked me  9. “Do you like pop music?” Hoa told Maryam. →Hoa asked Maryam  10. Where are you going tomorrow? , Amy asked me. → Amy asked me  11. “Why do you come here late?” She asked me. →She asked me 12. She asked Nam, “Why do you have to do this work?” →She asked Nam  13. “How often do you speak English with your classmates?” the examiner asked me → The examiners asked  14. “What will you do on your next summer vacation?” Mai asked me -> Mai asked me  15. “Keep silent, please.” The teacher said.

Cách làm:

- Đầu tiên, chúng ta cần nhận diện dạng của câu từ nguyên mẫu và chuyển đổi sang dạng gián tiếp.

- Sau đó, chúng ta chuyển những động từ thí quá khứ trong câu trực tiếp thành dạng ở thì quá khứ trong câu gián tiếp.

- Cuối cùng, chúng ta thay đổi các chủ ngữ và đại từ nhân xưng phù hợp trong câu.

Câu trả lời:

1. Maryam said she was having a good time there.
2. Minh said he was going on the Internet then.
3. She said to me she would go to China next week.
4. Mr. Phong said he must leave there for Nha Trang the following day.
5. Nam asked Lan if she was going to help him.
6. He asked the girl if she could play the piano.
7. Mai asked Mary if she could speak Vietnamese.
8. She asked me if I stayed at home that day.
9. Hoa asked Maryam if she liked pop music.
10. Amy asked me where I was going the next day.
11. She asked me why I came there late.
12. She asked Nam why he had to do that work.
13. The examiner asked me how often I spoke English with my classmates.
14. Mai asked me what I would do on my next summer vacation.
15. The teacher said to keep silent, please.

3. She said to me that she would go to China the following week.

2. Minh said he was going on the Internet then.

1. Maryam said she was having a good time there.

Phương pháp giải:
Ta có thể giải bài toán bằng cách sử dụng sự phân tích thừa số nguyên tố của 2940 và 210, sau đó tìm ra 2 số a và b thỏa mãn yêu cầu của bài toán.

Phân tích thừa số nguyên tố của 2940 và 210:
2940 = 2^2 * 3 * 5 * 7 * 7
210 = 2 * 3 * 5 * 7

Suy ra, 2940 = 2^2 * 3 * 5 * 7 * 7 = 2^2 * 3 * 5 * 7^2, và BCNN của 2940 và 210 là 2^2 * 3 * 5 * 7^2.

Do đó, ta có a = 2^2 * 3 = 12 và b = 5 * 7^2 = 245.

Vậy, 2 số tự nhiên a và b cần tìm là 12 và 245.