1. It is not necessary for you to finish the work to day.

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

12, Roller-skating doesn’t interest Sonia.

⇒ Sonia isn't interested in roller-skating

13, You ought to ride the bike more carefully next time.

⇒ You had  to ride the bike more carefully next time

14, My parents didn’t let me stay out late when I was young.

⇒ I wasn't allowed to stay out late when I was young

15, How long was your flight from Hanoi to Jakarta?

⇒ How long did it take you to fly from Hanoi to Jakarta?

16, George can cook very well.

⇒ George is a good cook.

17, Phillip usually works hard.

⇒ Phillip is hard at work

18, I am not as good at Math as my brother.

⇒ My brother is better at Math than me

19, They won’t be able to come on Saturday.

⇒  It will be impossible for them to come on Sunday.

20, Their father got to London by taxi last Monday.

⇒ Their father took a taxi to London last Monday.

Học tốt nhen :))
Cho t xin CTLHN ( nếu được :)