25. Volunteering is special to many people because they can help others.

- because : vì, bởi vì

- S + V (kết quả) + because + S + V (nguyên nhân)

26. A lot of souvenirs are sold  at the gate of the tourist site.

- Bị động thì hiện tại đơn : S + am/is/are + V3 + (by + O)

27. Peter thinks collecting glass bottles is interesting.

- find doing sth adj : thấy làm gì thế nào

= think doing sth to be adj : nghĩ làm gì thì thế nào

28. The film we saw last week is not as interesting as this one.

- So sánh không ngang bằng : S1 + to be + not + as/so + adj + as + S2.

25) because

- Volunteering is special to many people becausethey can help others.

26) are sold at the gate of the tourist site

- A lot of souvenirs are sold at the gate of the tourist site.

27)  collect glass bottles is interesting

- Peter thinks collect glass bottles is interesting.

28) 

- The film we saw last week is not as interesting as this one.

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