1. Having taken my boys to the playground, I saw them playing happily.
2. I spend twenty minutes going to school every day.
3. The boy suggested going to the mountainous areas that summer vacation.
4. Iohn invited me to join in our school dancing club.

câu 1 là thuộc dạng rút gọn mệnh đề bằng cách sử dụng perfect participle

câu 2 sử dụng cấu trúc spend time doing sth: dành thời guian làm gì

câu 3 và 4  là thuộc câu tường thuật

1 People should study to widen their knowledge and develop their intelligence

2 Education give us knowledge of things around us and it preserves the national noble traditionals and customs from generation to generation

3 Education is very important because in every country the government always considers education as the most important policy

4 Some people think they have finished their education when they leave school or graduate from the university but real education should never finish

Having taken to the playground, the boys playing happily

I spend twenty minutes going to my school everyday

The boy offer to go to the mountainous areas that summer vacation

John invited me to join in their school dancing club