1. The keepers feed the lions at 3 pm every day.
The lions are fed by the keepers at 3 pm every day.

Explanation: This is a passive voice transformation. The object ("the lions") becomes the subject, and the verb "feed" is changed to the passive form "are fed."
Structure:
Active: Subject + verb + object + time.
Passive: Object + be + past participle + by subject + time.
Translation: "Những con sư tử được các nhân viên cho ăn vào lúc 3 giờ chiều mỗi ngày."

2. We got lost because we didn't have a map.
If we had had a map, we wouldn't have got lost.

Explanation: This is a third conditional sentence, referring to a hypothetical situation in the past.
Structure:
If + past perfect, + would + have + past participle.
Translation: "Nếu chúng tôi có bản đồ, chúng tôi đã không bị lạc."

3. I would prefer you to deliver the sofa on Friday.
I would rather you delivered the sofa on Friday.

Explanation: When expressing preference using "would rather," the verb after "you" is in the past tense.
Structure:
Subject + would rather + someone + past tense.
Translation: "Tôi muốn bạn giao ghế sofa vào thứ Sáu."

4. The bridge was so low that the bus couldn't go under it.
It was such a low bridge that the bus couldn't go under it.

Explanation: This is a transformation using "such ... that."
Structure:
It was such + (a/an) + adjective + noun + that + clause.
Translation: "Cây cầu quá thấp đến mức xe buýt không thể đi qua được."

5. That was a silly thing to say.
What a silly thing to say!

Explanation: This is an exclamatory sentence transformation.
Structure:
What + (a/an) + adjective + noun!
Translation: "Thật là một điều ngớ ngẩn để nói!"

6. We've run out of tea.
There is no tea left.

Explanation: The sentence rephrases "run out of" to "no ... left."
Structure:
There is no + noun + left.
Translation: "Không còn trà nữa."

7. I last saw him when I was a student.
I haven't seen him since I was a student.

Explanation: This is a present perfect sentence indicating something that hasn't happened since a specific point in the past.
Structure:
I haven't + past participle + since + clause.
Translation: "Tôi không gặp anh ấy kể từ khi tôi là sinh viên."

8. Susan was too excited to sleep.
Susan was so excited that she couldn’t sleep.

Explanation: Transforming "too ... to" into "so ... that."
Structure:
Subject + was + so + adjective + that + clause.
Translation: "Susan đã quá hào hứng đến mức không thể ngủ được."

9. Robert has not had a job for two years.
Robert has been out of work for two years.

Explanation: "Has not had a job" is rephrased as "has been out of work."
Structure:
Subject + has been + out of work + for + time.
Translation: "Robert đã không có việc làm trong hai năm."

10. She will complete the work only if she is paid extra.
She will not complete the work unless she is paid extra.

Explanation: "Only if" can be transformed into "unless" with a negative clause.
Structure:
Subject + will not + verb + unless + clause.
Translation: "Cô ấy sẽ không hoàn thành công việc trừ khi được trả thêm tiền."