1. How old were you when you learned to drive?

2. My father gave up smoking three years ago.

2. to drive

-> learn to V: học làm gì

3. smoking

-> give up Ving: từ bỏ

4. keeping/to study

-> would you mind Ving: bạn có phiền, bận tâm...?

-> try to V: cố gắng làm gì