1. You don't have to finish the work to day.

(not necessary = don't have to: không cần thiết.)

(Bạn không cần phải hoàn thành công việc trong ngày.)

2. The visitor spoke too quickly for me to understand what he said.

(Cấu trúc too...to: S + V + too + adv + for sb + to V-nt.)

(Người khách nói quá nhanh khiến tôi không hiểu anh ta nói gì.)

3. Ann is a dangerous driver.

(Ann là một tài xế nguy hiểm.)

$1. $You don't have to finish the work today.

$→$ S + be + necessary + to + V
$=$ S + don’t/does + have + to + V

$2. $The visitor spoke too quickly for me to understand what he said. 

$→$ Cấu trúc too...to : S + V + too + adv + (for sb) + to + V

$3. $ Ann is a dangerous driver

$→$ S + V + adv

$=$ S + be + a/an + adj + N

$#HT:)))$