1. Billy asked his teacher if they would read the story.
-> Câu trần thuật nên lùi thì từ "will" thành "would"
2. Mary asked her boss if it was her he wanted to speak to.
3. Martha asked her girlfriend where she was going for her holidays.
4. Minh hasn't written to his pen pal for five months.
-> S + last + V2/ed + thời gian + ago = S + have/has + not + Vpp + for + khoảng thời gian
5. I haven't visited Kuala Lumpur for 3 years.
-> The last time + S + V2/ed + was + thời gian + ago = S + have/has + not + Vpp + for + khoảng thời gian
6. How long have you studied English?
7. I've found the book since this morning.
8. Sandra, who you were talking to, works in advertising.