1. David said that robots could never replace human beings.  
- Câu gián tiếp ⇒⇒ can →→ could
2. The man was attracted by the car's battery and its interior design.
- find sth + adj = be + adj + by sth
3. When I arrived in Da Nang, I made a video call home. 
- 2 vế cùng chủ ngữ, dạng chủ động →→ có thể rút gọn bằng hiện tại phân từ (V-ing)
4. She told me that I had to study harder if I wanted to be a doctor.
- Đổi ngôi: You →→ I
- lùi thì: have →→ had; want →→ wanted
5.  My friend said, "Scientists will explore Mars in the near future".
- Tiến thì: would →→ will + V
6. Video call makes it easier for us to see our loved ones every moment. 
- make + O + adj
- that + S + V

- for sb to do sth: để ai đó làm gì
7. It took us 2 hours to upload our video files to Youtube.  
- take sb time to do sth = sb spend time doing sth
8. She suggested that I should swap the bookcase for the TV.  
- suggest sb that + S + should + V: khuyên ai đó nên làm gì