Dưới đây là 3 ví dụ về ngữ pháp liên quan đến từng đơn vị mà bạn đã chỉ định:

### Unit 1: A Long and Healthy Life
1. **Thì hiện tại đơn**:
- "Regular exercise helps maintain a healthy lifestyle."
- "Eating fruits and vegetables is essential for good health."
- "People who sleep well tend to be more productive."

2. **Câu điều kiện loại 1**:
- "If you eat healthily, you will feel better."
- "If she exercises regularly, she will live longer."
- "If we drink enough water, we will stay hydrated."

3. **Gerunds**:
- "Exercising daily is crucial for a long life."
- "Avoiding junk food can lead to better health."
- "Meditating helps reduce stress."

### Unit 2: The Generation
1. **Thì hiện tại hoàn thành**:
- "Many people have embraced technology in their daily lives."
- "Younger generations have faced different challenges compared to their parents."
- "They have developed new ways to communicate."

2. **Câu điều kiện loại 2**:
- "If I were you, I would learn more about the previous generation."
- "If he had more time, he would spend it with his family."
- "If we understood each other better, there would be less conflict."

3. **Mệnh đề quan hệ**:
- "This is the generation that values innovation."
- "I have a friend who has traveled to many countries."
- "People who grew up in the digital age have different perspectives."

### Unit 3: Cities of the Future
1. **Câu hỏi đuôi**:
- "The cities of the future will be more sustainable, won’t they?"
- "We need to invest in public transport, don’t we?"
- "Smart technology will improve urban living, won’t it?"

2. **Câu điều kiện loại 3**:
- "If we had planned better, the city would have been greener."
- "If they had implemented the new technology earlier, traffic would have improved."
- "If we had focused on renewable energy, we could have reduced pollution."

3. **Cấu trúc "used to"**:
- "People used to rely on cars for transportation."
- "Cities used to be designed around the needs of cars."
- "We used to see less emphasis on green spaces in urban planning."

Hy vọng những ví dụ này sẽ giúp ích cho bạn trong việc nắm vững ngữ pháp liên quan đến các chủ đề này!