`4.` The Liittle Prince is the most interesting novel that I have ever read.

`->` S + have/has + never + V3/ed + such + a/an + adj + Noun + before

`=` This/That/Danh từ... + to be + the most + adj/adv + Noun + that + S + have/has + ever + V3/ed.

`5.` If you don't finish your homework, you can't go out with your friend.

`-` Câu điều kiện loại `1`

`->`  If + S + V, S + will/can/may (not) + V

Dùng khi điều kiện nói tới có thật, có thể xảy ra trong hiện tại/tương lai

`6.` They're not sure how to operate the new system.

`->` How to do sth: làm như thế nào

`7.` I spent 4 hours reading the first chapter of the book.

`->` It take(s)/took + S + time + to + V-inf

`=` Somebody spend(s)/spent + time + V-ing

`8.`  Tennis is not as dangerous as snowboarding.

`->`  S + to be + as +adj/adv + as + noun/ pronoun.