1. Jeff had difficulty in dealing with his depression.
- S + have difficulty in + V-ing = be difficult for sb to do sth
2. I spent two hours completing the news article about crime.
- take + time + to-V = spend + time + V-ing
3. I'm looking forward to living somewhere there is less pollution. 
- look forward to + V-ing
4. It's necessary to prevent the spread of diseases.
- important = essential
5. Would you mind helping me create a social media campaign about preventing bullying?
- Would you mind + V-ing
6. I have a dream of living in a world without war.
- want + to-V = have a dream of + V-ing
7. She has difficulty in finishing the project on time.
8. He spends twenty minutes riding to school.
9. We spent three years opening the shelter for the homeless.  
10. Mike recommended watching TV program about world hunger.
- recommend + V-ing
11. I apologize for having missed the charity event.
- apologise for + V-ing
12. The shop possibly gets a smart mirror. 
- Chuyển danh từ `->` trạng từ (hoặc có thể đổi thành tính từ, giữ nguyên,...)
13. Look at the clouds. It is going to rain. 
- Có dấu hiệu, chắc chắn sẽ xảy ra = TLG
14. People may go on space holidays in the future.
- Perhaps `->` may + V: có thể
15. It is possible that Harry can come with us.