→ S + think(s) + Ving + (N)+ is/are + adj

40. I find making models boring

→ S + find(s) + Ving + (N) + adj

41. My father taught me how to swim when I was 15 years old

→ Có "when I was 15 years old" → thì QKĐ: S + V2/ed + ...

42. Eating less junk food will help you avoid obesity

→ Động từ đứng đầu câu thêm -ing

→ will + V: sẽ ... (thì TLĐ)

43. You should spend less time playing computer games because they aren't good for your eye

→ Should + V: nên làm gì ; spend + time + Ving: dành thời gian cho việc gì