`1`.
`=>` I spent 4 hours reading the first chapter of the book.
- Spent/spend + time + V_ing : Dành 1 khoảng thời gian cho việc gì đó.
`2`.
`=>` Tennis isn't as dangerous as snowboarding.
- Cấu trúc so sánh bằng : (-) S1 + tobe + not + as + adj + as + S2.
`3`. (Sửa đề chút)
`=>` Jack was made to study a lot of the entrance exam to high school by his parents.
- Cấu trúc BĐ của QKĐ : (+) S + was/were + V_(ed/c3) + (by + O).
- Make/made + to V : Bắt, sai khiến ai đó làm gì.