1. **We will travel to Nha Trang with our friends next week.**

2. **This summer, I will not visit Sam Son Beach; I will go to Ha Noi with my parents.**

3. **I think that in the future, people will take up more outdoor activities.**

4. **I had to cook dinner last night because my mother was ill.**

5. **They have never eaten Mexican food before.**

6. **My brother has been living in Ho Chi Minh City since 2020.**

7. **They have been to many famous places around the world.**

8. **I bought a laptop yesterday, but up to now, I have not used it.**

9. **We started the game half an hour ago, but we have not finished it yet.**

10. **My father has been to London, but he has not seen Big Ben.**

11. **How long have you been a member of Green Summer?**

12. **We helped them by donating books and clothes.**